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ASVAB · Fractions, Decimals, and Percentages

What is 15% of 80?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

12

  1. A 15
  2. B 12
  3. C 8
  4. D 20

Why this is the answer

Percent of a number = (percent ÷ 100) × number. 15% of 80 = 0.15 × 80 = 12. Three methods to solve percent problems: (1) Convert percent to decimal and multiply: 15% = 0.15; 0.15 × 80 = 12. (2) Use the fraction equivalent: 15% = 15/100; (15/100) × 80 = 1200/100 = 12. (3) Set up proportion: 15/100 = x/80; cross-multiply: 100x = 1200; x = 12. Useful percent shortcuts to memorize: 10% = move decimal point one place left (10% of 80 = 8); 1% = move decimal two places left; 25% = ÷ 4; 50% = ÷ 2; 75% = (number × 3) ÷ 4. For 15%: take 10% (which is 8) and add half of that (4) = 12. Practice mental math with percentages — it saves time on the ASVAB.
Source: ASVAB AR — Percent Calculations

Practice more questions

This question is from our ASVAB Practice Tests practice test. Take the full practice test to test your knowledge across all Fractions, Decimals, and Percentages and other topics.

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About this topic: Fractions, Decimals, and Percentages

Fractions, decimals and percentages appear in nearly every ASVAB maths section. These questions cover converting between the three forms, finding a percentage of a number, percent change and operations with mixed numbers. This is one of 10 Arithmetic Reasoning questions on fractions, decimals, and percentages, each with a full explanation on a single study page.

New to this exam? Our ASVAB exam guide explains the format, scoring, and how to prepare.

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