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40% as a Decimal (and Fraction)

Decimal0.4
Decimal
0.4
Percent
40%
Fraction
2/5

Percent means “per hundred”: divide a percentage by 100 to get a decimal, multiply a decimal by 100 to get a percentage.

40% = 0.4

40 percent as a decimal is 0.4 — divide by 100.

Step by step

  1. Percent means per hundred, so divide by 100: 40 ÷ 100 = 0.4.
  2. Equivalently, move the decimal point two places to the left.
  3. As a fraction: 2/5.

Details

Decimal
0.4
Fraction
2/5
40% of 50
20
40% of 200
80
40% of $1,000
$400
Multiplier for a price increase
× 1.4

How it works

A percentage is a number out of 100. To use it in a calculation, convert it to a decimal by dividing by 100 — then multiply: 25% of 80 is 0.25 × 80 = 20. To increase a number by a percentage, multiply by 1 plus the decimal; to decrease it, multiply by 1 minus the decimal.

Nearby values

PercentDecimal
20%0.2
25%0.25
30%0.3
33.3%0.333
35%0.35
40%0.4
45%0.45
50%0.5
55%0.55

Related conversions

Frequently asked questions

What is 40% as a decimal?

0.4.

What is 40% as a fraction?

2/5.

How do I calculate 40% of a number?

Multiply the number by 0.4.

How do I add 40% to a price?

Multiply the price by 1.4.

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