AMC 8 Fractions, Decimals & Percents

Question 1

What is 3/4 + 5/6?

Accepted Answer

19/12

Answer

Converting to a common denominator: 9/12 + 10/12 = 19/12.

Question 2

What is 25% of 80?

Accepted Answer

20

Answer

25% of 80 = 0.25 × 80 = 20.

Question 3

Express 0.625 as a fraction in lowest terms.

Accepted Answer

5/8

Answer

0.625 = 625/1000 = 5/8 after dividing numerator and denominator by 125.

Question 4

A price increases from $40 to $50. What is the percent increase?

Accepted Answer

25%

Answer

Percent increase = (change / original) × 100% = (10/40) × 100% = 25%.

Question 5

What is 7/8 − 1/3?

Accepted Answer

13/24

Answer

7/8 − 1/3 = 21/24 − 8/24 = 13/24.

AMC 8 - American Mathematics Competition 8 Practice Test