Praxis Core Academic Skills for Educators: Mathematics (5733)Number and QuantityEasy
A quality control technician inspects a batch of 480 electronic components. If 1/16 of the components are found to be defective, how many components are NOT defective?
- A456
- B30
- C450
- D464
Show answer & explanationAnswer & explanation
Correct answer: A. 456
First, calculate the number of defective components. Then subtract that number from the total to find the non-defective components.
Why the other options are wrong
- B. This is the number of defective components, not non-defective.
- C. This would be correct if 1/10 of the components were defective, not 1/16.
- D. This is an incorrect calculation; it would result from subtracting 16 from 480, not 1/16 of 480.
Fractions of a Whole
To find a fraction of a whole number, multiply the fraction by the whole number. To find the remainder, subtract this result from the whole.
- Represents a part of a total.
- Numerator is the part, denominator is the whole.
- Can be used to calculate specific quantities within a larger group.
Memory trick: Slice the whole, then count what's left.