Praxis Core Academic Skills for Educators: Mathematics (5733)Number and QuantityEasy
A nutritionist is calculating the caloric content of a meal. A serving of rice contains 200 calories. If 3/5 of these calories come from carbohydrates, how many calories from carbohydrates are in one serving of rice?
- A150 calories
- B40 calories
- C120 calories
- D60 calories
Show answer & explanationAnswer & explanation
Correct answer: C. 120 calories
To find a fraction of a whole number, multiply the fraction by the whole number. This calculation directly gives the part of the total that corresponds to the given fraction.
Why the other options are wrong
- A. Incorrect calculation: 200 * (3/4) = 150 (if it was 3/4).
- B. Incorrect calculation: 200 / 5 = 40 (1/5 of the total).
- D. Incorrect calculation.
Fraction of a Whole Number
To calculate a fraction of a whole number, multiply the fraction by the whole number. This operation determines what portion of the total quantity the fraction represents.
- The word 'of' in math often indicates multiplication.
- Multiply the numerator by the whole number, then divide by the denominator.
- Can be used to find parts of quantities, percentages, or ratios.
Memory trick: Fraction Times Whole, Find the Part!