Math Formula GED

Math Formulas for GED

The GED (General Educational Development) test includes essential math concepts that often require knowing key formulas. These formulas are commonly used in areas such as geometry, algebra, and basic arithmetic. Here, we’ll cover some important math formulas and provide examples to help illustrate their use.

1. Area of a Rectangle

The formula for finding the area of a rectangle involves multiplying its length (l) by its width (w).

Formula: Area = l × w

Example: Find the area of a rectangle with a length of 5 units and a width of 3 units.

• Given: l = 5, w = 3
• Calculation: Area = 5 × 3 = 15 square units
• Result: The area is 15 square units.

2. Slope of a Line

The slope of a line, represented by the letter "m," can be calculated when you know two points on the line. The formula is:

Formula: m = (y₂ - y₁) / (x₂ - x₁)

Example: Find the slope of a line passing through points (1, 2) and (3, 6).

• Given: (x₁, y₁) = (1, 2), (x₂, y₂) = (3, 6)
• Calculation: m = (6 - 2) / (3 - 1) = 4 / 2 = 2
• Result: The slope of the line is 2.

3. Simple Interest

Simple interest is calculated using the formula where P is the principal amount, r is the rate, and t is time in years.

Formula: Interest = P × r × t

Example: Calculate the interest on $1000 at a rate of 5% per year for 3 years.

• Given: P = 1000, r = 0.05, t = 3
• Calculation: Interest = 1000 × 0.05 × 3 = 150
• Result: The interest is $150.

Conclusion

Knowing these key formulas can greatly aid in solving questions on the GED math test. Practicing with these examples ensures that you’re well-prepared for the test and can apply these formulas confidently.

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