GED Math Practice Test Review

Triangle Area Calculation

• Use the area formula from the formula sheet.
• For a triangle with a 90° angle, the two sides forming the angle are the base and height.
• Formula: Area = 0.5 * base * height.
• Example: Base = 2.8, Height = 2.4, Area = 3.36.

Equation of a Line Passing Through Points

• Use y = mx + b form.
• Check equations by substituting values.
• Example: Line through points (-5, 0) and (4, 3) is checked via calculator.

Finding the Median

• Arrange numbers in ascending order.
• Find the middle number for an odd set of numbers.
• For even numbers, average the two middle numbers.
• Example: Median of 7 numbers: 46.

Calculating Perimeter

• Add the lengths around the edge of a shape.
• For missing parts, use equivalent parts from the same orientation.
• Example: Total perimeter in a complex shape: 184.

Multiplying Decimals (No Calculator)

• Multiply as integers, then adjust decimal places.
• Example: 5 * 3, 5 * 2, 5 * 4, etc.*

FOIL Method

• Multiply the terms: First, Outer, Inner, Last.
• Combine like terms for the final expression.
• Example: (2x - 5)(x + 4) = 2x^2 + 3x - 20.

Solving for Toppings in Pizza Cost

• Equation with total cost and number of toppings.
• Substitute values to find number of toppings.
• Example: Cost = $24.50, toppings = 5.

Circle Area Calculation

• Use the formula A = πr².
• Plug in radius for calculations.
• Example: Radius = 0.8, Area = 2.01.

Matching Equation to Graph

• Identify y-intercept and slope.
• Compare graph intercepts and slopes to find the correct match.

Substitution in Equations

• Substitute specific numbers for variables.
• Use parentheses for clarity.

Volume of Box

• Volume = length × width × height.
• Solve for missing dimension if needed.
• Example: Given dimensions, h = 12.25.

Volume of Cone

• Volume = 1/3πr²h.
• Given diameter, find radius (half of diameter).
• Solve for height using provided options.

Maintaining a Function Table

• Ensure no repetition in ordered pairs.
• Assign new unique values to maintain function integrity.

Solving Inequalities

• Identify correct inequality symbols.
• Example of savings account: Use ≥ for ensuring minimum savings.

Solving Equations with Parentheses

• Distribute multiplication across terms inside parentheses.
• Collect like terms and solve for the variable.
• Example: 7x + 12 = 15, solve for x = 3/7.

These notes summarize the key techniques and examples from the GED Math practice problems, giving insight into typical test problems.