Step 5. Dividing 4000 by 100: 10 percent of 400 = 40. 40 is, therefore, equal to 10% of 400. The pie chart below lets us see how all parts fit together. Figure 1: The 10 percent of 400. 10% of 400 is 40, which is what the orange area shows. The area of the whole pie chart, which shows the whole value, equals 400.
40 is 10% of 400. Steps to solve "40 is 10 percent of what number?" We have, 10% × x = 40; or, 10 / 100 × x = 40 Multiplying both sides by 100 and dividing both sides by 10, we have x = 40 × 100 / 10 x = 400. If you are using a calculator, simply enter 40×100÷10, which will give you the answer.