QUESTION: 61 Topic - Section: Math

Which number is a factor of 42?

24
21
9
40

Answer(s): B

Explanation:

Factors are numbers you can multiply together to get another number. The factors of 42 are 7, 6, 2, 21, 1, 42, 14 and 3. From the choices given, 21 is the correct answer.

Reveal Solution Next Question

QUESTION: 62 Topic - Section: Math

What is 80% of 500?

380
412
400
392

Answer(s): C

Explanation:

Always remember that percentage is a mathematical expression for “a part of a whole” or per 100. For this question, we know the percentage and the whole, but not the part. Simply substitute the given numbers to the formula, part/whole = percentage/100; we don’t know the part, so we call it a, and so we have: a/500 = 80/100. Then, a = 500 × 0.80 = 400. The correct answer is 400.
If you become familiar with questions like this, you know that to get the part represented by the percentage, you simply multiply the given number (500) by the decimal form of the percentage (0.80); and quickly get 0.80 × 500 = 400.

Reveal Solution Next Question