What Is 30% of 40?

30% of 40 is 12, the same as 3/10 of 40.

Result

Answer

12

30% of 40 is 12.

  • 40 + 30%: 52
  • 40 − 30%: 28
1230% of 40

Step-by-step solution

The problem

{30}\% \text{ of } {40}

  1. Change 30% to a decimal. Divide by 100.

    30\% = 30 \div 100 = 0.3
    = \textcolor{#0b5c56}{0.3} \times 40

  2. Multiply. Leave out the decimal points and multiply, then put the point back. Count the decimal places: 0.3 has 1, so the answer has 1.

    \begin{aligned} 3 \times 40 &= 120 \\[10pt] 120 \div 10 &= 12 \end{aligned}
    = \textcolor{#0b5c56}{12}

All the working together

\begin{aligned} &{30}\% \text{ of } {40} \\[8pt] &= 0.3 \times 40 && \textcolor{#5b6660}{\textsf{percent → decimal}} \\[8pt] &= \textcolor{#0b5c56}{12} && \textcolor{#5b6660}{\textsf{multiply}}\end{aligned}
What is % of ?

30% of 40 at a glance

30% of 4012
30% as a fraction3/10
40 + 30%52
40 − 30%28

30% of other numbers

QuestionAnswer
30% of 103
30% of 154.5
30% of 206
30% of 257.5
30% of 309
30% of 4012
30% of 5015
30% of 6018
30% of 7021
30% of 7522.5
30% of 8024
30% of 9027
30% of 10030
30% of 12036
30% of 15045
30% of 20060
30% of 25075
30% of 30090
30% of 500150
30% of 1000300

Other percents of 40

QuestionAnswer
1% of 400.4
2% of 400.8
5% of 402
10% of 404
12% of 404.8
15% of 406
18% of 407.2
20% of 408
25% of 4010
30% of 4012
33% of 4013.2
35% of 4014
40% of 4016
45% of 4018
50% of 4020
60% of 4024
70% of 4028
75% of 4030
80% of 4032
90% of 4036

Frequently asked questions

What is 30% of 40?

30% of 40 is 12: change 30% to a decimal (0.3) and multiply by 40.

What is 40 plus 30%?

40 increased by 30% is 52 (40 + 12).

What is 40 minus 30%?

40 decreased by 30% is 28 (40 − 12).

Any other percentage question – a part as a percent, percent change, percent difference: use the Percentage Calculator.