Lattice Multiplication

Introduction

• Topic: Lattice multiplication method.
• Example Problem: Calculate 25 * 13.*

Steps for Lattice Multiplication

Setting up the Grid

1. Determine Digits

   • First Number (25): 2 digits.
   • Second Number (13): 2 digits.

2. Create a Grid

   • Form a rectangle with space for two columns and two rows.

3. Labeling

   • Top: Write 25.
   • Side: Write 13.
   • Ensure numbers match with columns and rows.

Drawing the Lattice

• Split each box diagonally.

Solving the Multiplication

Multiplication Step

1. Multiply each digit of the top number by each digit of the side number, filling in the lattice:
   • 5 * 1 = 5 (write 05)
   • 5 * 3 = 15 (write 15)
   • 2 * 1 = 2 (write 02)
   • 2 * 3 = 6 (write 06)

Addition Step

• Add numbers diagonally:
  • Bottom right: 5.
  • Next diagonal: 5 + 1 + 6 = 12 (write 2, carry 1).
  • Next diagonal: 1 + 2 = 3.
  • Top left: 0 (no need to write).

Final Answer

• The result is 325.

Conclusion

• Lattice multiplication provides a structured method for solving multiplication problems.
• Example demonstrated: 25 * 13 = 325.*

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