(phone notification) after 5 years have passed I didn’t expect this day would come finally he returns to this battle but for sure I will not lose if he has mastered all the math formulas I might have a bit of difficulty lose? hahaha I am the strongest strong hahaha it takes more than just being strong to fight me we are math enthusiasts welcome to math battle welcome back after 5 years to math battle nihongo mantappu oh it’s been 5 years? it doesn’t feel like it wow bro that was in 2019, right? even before covid yeah, we were still in college back then yeah, we were still young wow wow still like konni jiwa konni jiwa~ konni jiwa bro so how is it now huh, how is the situation now ha ha okay, how’s it going, Bil? how are you? I’m good, Jerome, how about you? I’m good too, we both graduated he from NTU Math Science, right I also graduated from Waseda University Applied Math, for those who don’t know we first met at the olympiad and we became close and we’re also rivals the first math battle on your content the first math battle on nihongo mantappu was me and Billy and it was trending right away for content math in Indonesia it made it to trending, I remember it clearly wow, we’re going to repeat this repeat? repeat the massacre? oh no who won back then? Was it me? It was you [Math Battle]
Rules:
Each player is allowed to answer questions
Players may use notes as aids
If a player wants to answer, they must raise their hand in your first battle there were no rounds, right? no, no rounds now our friends are more advanced with more challenging questions and harder wow wow wow welcome to round one in round one not yet! still joking welcome to round one round one will feature questions that are trending recently round one will be special with Cryptarithm questions are you ready? are you ready? by the way, cryptarithms were in the olympiad so in our olympiad days we often studied question number one three two one Billy A is 9 S is 1 M is 1 oh wrong, wrong oh, can be, can be A is 9 A is 9, S is 2 M is 1, O is 0 Correct! Even though I had written it! (laughs) Okay Close Haha, point for Billy Next question is a mess This is medium level, ready? One, two, three They are so serious, guys Wow, Billy again A is 2 Yes, correct B is 5, C is 3 A=2 B=5 C=3... Correct! So fast! Billy is working so fast In these 5 years, I’ve been practicing non-stop, bro For this moment, bro! For this moment (this is serious) Ready? One, two, three (crazy, I’m getting crushed) It’s been a long time since I felt this nervous Because it seems like The last time I hosted a math battle was last year Will Jerome with his black ink? Or will Billy with his red ink?! And seeing the opponents, let’s see Billy, please, your answer U=8 S=5 A=1 and L=0 Correct! Wow!! Jerome is sad Current score 3-0, led by Billy So bad! Okay guys, now I want to discuss the question US plus AS equals ALL Now, first of all, we know that each digit Each letter represents a number And they can’t be the same Right, then here we know US And AS are two-digit numbers Which means the maximum is 99 The highest possible sum is 198 So If we sum them, the maximum is just 198, which means A must be 1 Because it can’t reach 200 It must be one, yes So let’s Write it down and see The S here is a two-digit number That starts with one So it’s between 10 and 19 19 And we know US plus this One S should be a hundred What does that mean, friends? If U is 7 or 6 60s plus The maximum is 19 it's impossible to reach 3 digits like that, 79 plus 19 is only 98, right so U must be either 8 or 9 so the top one is in the 80s or 90s well, from here we manually try, friends earlier I used my instinct my intuition told me to try the number 8 so I just input 8 this is U I tried U as 8 so 80 something plus 10 something equals 1...LL LL has the same number, right then I just tried directly when I tried 85 and 15 when added 5+5 0... 1,8,1... 0 =100 so it’s perfect but actually from here you can actually there’s a hint because 8,1 there’s one L isn’t it? yes, it is S plus S cannot be more than 20 oh right it must be 1, right? yes, 1 so L is 0 so 0 here makes sense oh yes, yes, yes exactly if we think slowly we might come up with it but if earlier it was correct it makes sense because two digits the largest sum is 19 18 is 9+9 it cannot be 2 so it must be 1 oh yes, yes, that’s right so this must be 2 L yes, great indeed, the red pen is not wrong, bro the red pen this is the red pen this red pen, guys okay, let’s just give it we will move on to the last medium question after that we will double the points to move to the hard the 4th question before we double the points is as follows three two one please take a look okay M=1 A=4 T=3 and H=7 M=1 A=4 T=3 and H=7 exactly Jerome! finally scores! current score 3-1 and this is Jerome’s chance to tie the score or Billy’s chance to make the score gap wider question number 5 the last question in this round we will double the points okay, current score 3-1 I’m serious now things seem to be heating up, buddy we will test Jerome’s heat and Billy’s streak with this one question three two one seems confused, buddy why has the question become difficult? because in Cryptarithm we need to find the value of each letter in the question since there are quite a few letters here so we need to solve for around 9 letters okay, go ahead Jerome is faster this time than Billy one by one, okay C is 3, E is 4, H is 7 M is 9, O is 0 P is 1, R is 2 U is 8, W is 5 correct things are heating up, buddy! okay, let’s give a round of applause for round 1! exciting, right? what’s the score? 3-3! from trailing 3-0 to catching up to 3-3 the questions were quite challenging, bro but everyone is awake now yes, yes everyone’s awake, it’s time, bro this will be very exciting because in round 2 we will have questions that viewers at home can also solve namely CPNS and UTBK questions okay, this will consist of five more problems there are 5 more questions and the system will be divided into two so the first three questions will be shown and the last two will be read out okay, ready for question number one 2030 Jerome... 2030? yes correct! yes, that’s right can you share the trick? because this 2027 is below the status is X-3 then X-2 / 2028 and X-1 / 2029, right? correct since the result is round it’s definitely that my first instinct is that the top ones must be 2029, 2028, 2027 to make one, one, one so X is 2030 fits, right? but if I try X as 2030 it doesn’t work for me oh right, so the first instinct first instinct first because this is CPNS and UTBK where we need to be quick the questions are designed to be quick the next question is still shown 3...2...1... X = 8/3 correct! Jerome is indeed the expert here okay, okay Billy should be farming points there exactly okay, okay, correct again, the answer is 8/3 why Jerome? okay, the question was like this if there’s a root, for example, root A the root is A power of half like that yes, we take the power of half now 3 to the power of X in the root, root 3 to the power of X means 3 to the power of X times half so 3 to the power of X divided by 2 yes, this one and this one this is in the root again root, root, so this is 9 to the power of X yes, 9 to the power of X times this half power times this half again so 9 to the power of X divided by 4 but 9 is 3 squared so this is 3 squared X divided by 4, so it equals 3 to the power of X divided by 2 as well so this in the root is 3 to the power of X divided by 2 now 81 to the power of X times half of it has powers one, two, three yes, there are three roots above so half, half, half equals 81 to the power of X divided by 8 now 81 is 3 to the power of 4 so 3 to the power of 4 times X divided by 8 equals 3 to the power of X divided by 2 as well so the top part is 3 to the power of X divided by 2 times 3 to the power of X divided by 2 times 3 to the power of X divided by 2 this is the same as if you multiply multiply like this add the exponents so three to the power of three X divided by 2 equals how much? 81 yes, 3 to the power of 4 since this is all 3 so this matches with this so three X divided by 2 equals 4 so X equals 8 divided by 3 ta-da, that's great I already calculated why is it cold? on top! so proud one of the exciting things when watching the math battle between Jerome and Billy is... both of them already know the answers it's just a matter of who speaks first yeah, yeah okay, the last question in this round will be shown the rest will be read yes, one two and three wow, this is Billy he’s the abacus kid the answer is C. 25.9 correct! the answer is 25.90 oh yes because it's not okay because Billy is the abacus kid so it's a race, so I once tested it’s a race like this, dividing my score was 30, his was 70 twice as much oh, this one can be reasoned as well actually from the answer choices this is pretty clear yes, that’s right compared to the answers if the choices were 26, 25, 27, it would be harder yes, true, but if it’s like this this is really far off so it’s just a rough guess 0.04 times 10? 0.4, right? times 2 is already 0.8. 2 and a half is already 1 just an estimate still cold, bro? it's already quite sweaty the current score is 2-1 2-1, and after this we will I’ll read the question ready? the minimum value of the quadratic function F is -8 and the graph of this function passes through the point (-1,0) and (3,0) the graph of this function also passes through the point (4, b) b = ? the answer could be b = 10 b = 10 is the correct answer okay, okay, okay this one requires quite a bit of calculation because this is due to the minimum value the minimum value means -B squared divided by 4A + C equals -8 this and passing through -1,0 means Ax squared plus Bx plus C when x = -1 so A - B + C = 0 and 9A + 3B + C = 0 so these three equations are quite lengthy next question the last question in this round I will read listen carefully at an event there is a round table with eight chairs labeled M, A N, T, A, P, P, U, mantappu in clockwise order if each guest sits in the chairs in turn starting from chair M and continues repeating until all chairs are filled which chair will the 701st guest sit in? me! please A correct and this fits perfectly Why was Billy able to answer so quickly? Because it’s basically division divided by 8 remainder is 5 Wow, you calculated that fast Incredible, incredible This is the difference between someone who uses an abacus and someone who doesn’t That’s the difference But there are drawbacks, bro We don’t like to find tricks Oh, you prefer direct calculations So we rarely know tricks Yeah, yeah, yeah Oh, you prefer direct methods Yeah, because it’s straightforward So abacus users usually prefer manual calculations Just quick and direct If I’m not an abacus user, I’d look for quick tricks True, if it’s algebra and stuff, it’s correct But if it’s like this, no trick It’s all manual Everything is much faster Okay, okay, the score The current score is 3-2, led by Jerome Polin 3-2 with Jerome in the lead One point difference And we will move on to the final round If the score is tied If the score is tied as usual, with Bang Ian there will be a bonus round Anyone want to guess what the category for round three might be? Olympiad questions Correct Round 3 is the category that unites Jerome and Billy Olympiad questions So to honor your meeting after the last 5 years I will give Olympiad questions in your battle Are you ready? First question, one two, three Please go ahead The answer is 10 The answer is 10 The answer is 10 That's correct The answer is 10, where Oh right, 10 A=1, B=2 C=3 And D=4 So earlier when this question appeared, guys I immediately Knew Jerome would lose Because, because I used to do this a lot back in elementary school 12 years ago, guys Yeah, I believe it too, but So for this problem, guys We start from the fraction, right? So earlier This is the same as length But let’s start with the simplest part first, guys 43 over 30 If we convert it to a mixed fraction What does it become Friends It becomes One and 43 minus 30 equals 13 over 30, right? So directly This whole number one is A Which is here, A, great So A equals 1 Right, and the rest is one over Here’s B So since A is already 1 The remaining part is which one, friends? It’s 13 over 30, so 13/30 Equals 1/B plus Then What happens if we flip both sides? We flip them, friends So this one we flip, the bottom So the top becomes 30 over 13 We flip this one, friends So B Plus 1 over la la la This is over 1 Because it’s over 1, so done It's the same, right? Now let’s use the same method again, friends We convert this fraction to a mixed fraction, 30/13 It becomes 2 4/13 Equals B Plus 1 over ..... So just go ahead, guys That means B is 2, right? So B is 2 Then 4/13 is 1 over... Then we repeat the process We flip 13/4 Which gives us C C plus... So 3, 1 over 4 Equals C + 1/D in the question So C is 3 Three And D is 4 Which is 4 here Nice, yes Great, okay Very good, very good, very good, very good, okay Both are at the top Now they are, okay Both are at the top Both are at the bottom The next question is as follows Three two one, please Alright, alright, alright Alright, alright The answer is 5 The answer is 5 How did that happen, Billy? Because earlier I Had a hunch, right Cube root Of 2 plus 1 over If you multiply it, it can be simplified So I just Cubed X Then, then, then Later I found the pattern X cubed B cubed, right A cubed plus B cubed plus 3 AB squared So it looks like this X cubed equals 5/2 plus 3 times X Yes, then X cubed minus 3X equals 5 over 2 What is asked Just multiply by two Oh, right, right, haha Earlier I didn’t even realize So my answer is 5 5 and that is the correct answer Oh no, I’m So hot right now Where are the jackets? Ready for the next one, I’ll read it To make it more challenging Given X Y and Z Satisfy the equation The following equation X - 7Y + 8Z = 4 And 8X + 4Y - Z = 7 Find the maximum value Of x squared Minus y squared plus z squared x squared minus y squared 1 No repetition Why could it be one? Can you give a Simple explanation Because of feeling Because of feeling And it turns out your feeling was right Sometimes if they Use feeling Use instinct and feeling I don’t understand what it means A person just writes a question Can you explain 16+49 What is that? 65 64+1 is also 65, right Yes, right 64+1 is 65 so I have done a similar problem but with different numbers I just feel like This will probably be the same Next question with the current score 2-1 Led by Billy I will read it again The question is as follows Hailey writes one number Then she writes another number next to it She adds 27 to the number obtained and gets 91 What is the first number she wrote? 4... oh 6! 6! Who answered 6 first? Jerome first, right? Jerome said 6 The correct answer is 6 She wrote 64 Yes I The first number, that’s what was asked The left side, then the 4 What? The right side, yes Ah, oh yes Okay, okay, okay Hailey... Hailey This is also quite easy So when she writes two numbers like that It can be expressed as That two-digit number can be expressed as 10a + b For example, a two-digit number ab For instance, 23... 23 That’s 2x10 + 3, right? Yes, 20 + 3 Yes 20 + 3 like that, same here So the equation 10a + b + 27 = 91 So 10a + b = 64 a is 6 and b is 4 So the number is 64 Earlier I forgot which number was written first From the left side Okay, the current score 2-2 This will determine the outcome of this round If Billy Answers correctly We will move to the bonus question If Jerome Answers correctly Then Jerome will be the winner Okay Question number 7 cannot be read So I need to show it In three, two, one Fun fact, this is a problem From the elementary school olympiad From the International Junior Math Olympiad, primary grade 6 Locked? Locked Correct! So intense, right? Another game Earlier I tried to guess I couldn’t so I Redrew it I kept looking at it I kept looking I was just guessing I was staring at it like this And there was also Bang Ian’s figure behind me Oh no Okay, the bonus question that will determine the champion of this battle The rematch of these five years The bonus question will be read with some conclusions Which you can note down Note the two sentences that I will mention below First sentence 2 square root of 6. Second sentence Square root of 2 plus square root of 3 plus square root of 5 The first sentence I mentioned Is the numerator of a fraction While the second sentence is the denominator Simplify the following fraction Eh, which one is the numerator? Careful, boss It’s definitely the bottom Careful, boss So square root of 2 Plus square root of 3 minus square root of 5 Without divided by 2? Without divided by 2 Correct! Why is there square root of 30? There is square root of 30 Then this is square root of 30 Later, it will be simplified to 6 square root of 5 Later there will be square root of 30 divided by square root of 6 Yes, calculation mistake Calculation mistake Okay The rematch math battle this time is narrowly won by Billy Kurniawan! Shake hands first Shake hands first Shake hands first One point difference One point difference Not a slaughter It felt like it, bro Yeah, it felt like it Great So exciting This was really exciting It’s been a while It’s been a while since I’ve been in such a tense position Thinking constantly Intense Yeah, absolutely Amazing, amazing, amazing Okay guys, the battle is over That was really exciting, Bill Actually, what have you been busy with lately? Lately Yeah Yeah Recently, I’ve been inactive on Instagram And on YouTube, I used to make math content That’s right Actually For the past few years I’ve been focusing on the corporate world Let’s say working Yes, working But also in the education field But in the corporate sector, yes But now I’m focusing on Wanting to start making content again Educational content, so you want to resign? Resign, quit, bro Want to focus on teaching Especially math Wow, but that was such a fun math battle just now It was really fun Really fun And math is really fun if we understand the concept I agree As long as we understand what we’re doing And it can be explained in a reasonable way Then I think math will be really fun I also feel that way. Now, I’ve just finished my studies I just finished my studies too YouTube too Regular content But I’m starting to create Mantappu Academy Oh yes, I saw your story You want to start a tutoring center now Yes, initially the focus will be on teaching. Maybe someday you could teach too Wow You’re allowed to Since you’ve beaten the boss Not really, actually, we’re even Just that it's about time The pressure and all Actually Okay, thank you Bill Thank you so much, Jer Looking forward to the rematch If you want a rematch between us Comment, guys If this can trend again Awesome math battle Cool, yeah, let’s go And educational content is ready Okay, so for everyone watching Thank you See you Mantap Jiwa Wow, 5 years ago, bro! Can do it