GED Mathematical Reasoning TestQuantitative Problem Solving with Rational NumbersEasy
A baker uses 3/4 cup of sugar for one batch of cookies. If the baker wants to make 2 1/2 batches of cookies, how much sugar in cups will be needed?
- A1 7/8 cups
- B3 cups
- C2 1/8 cups
- D1 1/4 cups
Show answer & explanationAnswer & explanation
Correct answer: A. 1 7/8 cups
To find the total sugar needed, multiply the sugar per batch by the number of batches: (3/4) * (2 1/2) = (3/4) * (5/2) = 15/8 = 1 7/8 cups.
Why the other options are wrong
- B. This results from an incorrect calculation, possibly 3/4 * 4.
- C. This results from an incorrect calculation or estimation.
- D. This results from an incorrect calculation, possibly 3/4 + 1 1/2.
Multiplying Fractions
To multiply fractions, multiply the numerators together and the denominators together. Convert mixed numbers to improper fractions first.
- Convert mixed numbers to improper fractions.
- Multiply numerators.
- Multiply denominators.
- Simplify the resulting fraction if possible.
Memory trick: Many cookies need many fractions multiplied just right.