The GMAT tests your ability to do math-and to NOT do math! By plugging in numbers into percent problems on the GMAT’s quantitative section, you can convert ugly fractions into straightforward arithmetic-and into points!
Percent & Conversions
The word percent means per 100. It is a fraction whose denominator is 100. For example, 26% is equivalent to the fraction 26/100.
A percentage is used to compare values. It can describe the relationship of a part to a whole, or it can describe a magnitude of change.
Decimal to Percent
To change a decimal number to a percentage, multiply by 100; this moves the decimal point 2 places to the right. Then add the percent symbol.
0.32 = 32% 0.07 = 7% 1.75 = 175%
Percent to Decimal
To change a percentage to a decimal, divide by 100; this moves the decimal point 2 places to the left. Then remove the percent symbol.
25% = 0.25 90% = 0.90 = 0.9 32.1% = 0.321 100% = 1
Fraction to Decimal
You can convert a fraction to a decimal by dividing the numerator by the denominator. Sometimes a quicker method is to change the fraction so it has 100 as the denominator.
21/100 = 0.21
43/50 = 86/100 = 0.86
13/16 = 13 ÷ 16 = 0.8125