We already have our first value **40** and the second value **31**. Let's assume the unknown value is **Y** which answer we will find out.

As we have all the required values we need, Now we can put them in a simple mathematical formula as below:

STEP 1 Y = 40100

STEP 2 Y = 40100 × 31

STEP 3 Y = 40 ÷ 100 × 31

STEP 4 Y = 12.4

Finally, we have found the value of Y which is 12.4 and that is our answer.

If you want to use a calculator to know **what is 40 percent of 31**, simply enter **40 ÷ 100 × 31** and you will get your answer which is **12.4**

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Here is a calculator to solve percentage calculations such as what is 40% of 31. You can solve this type of calculation with your values by entering them into the calculator's fields, and click *'Calculate'* to get the result and explanation.

**Question:** At a high school 40 percent of seniors went on a mission trip. There were 31 seniors. How many seniors went on the trip?

**Answer:** 12.4 seniors went on the trip.

**Question:** 40 percent of the children in kindergarten like Thomas the Train. If there are 31 kids in kindergarten, how many of them like Thomas?

**Answer:** 12.4 kids like Thomas the Train.

Let's solve the equation for Y by first rewriting it as: **100% / 31 = 40% / Y**

Drop the percentage marks to simplify your calculations: **100 / 31 = 40 / Y**

Multiply both sides by Y to transfer it on the left side of the equation: **Y ( 100 / 31 ) = 40**

To isolate Y, multiply both sides by 31 / 100, we will have: **Y = 40 ( 31 / 100 )**

Computing the right side, we get: **Y = 12.4**

This leaves us with our final answer: **40% of 31 is 12.4**

40 percent of 31 is 12.4 |

40.01 percent of 31 is 12.403 |

40.02 percent of 31 is 12.406 |

40.03 percent of 31 is 12.409 |

40.04 percent of 31 is 12.412 |

40.05 percent of 31 is 12.416 |

40.06 percent of 31 is 12.419 |

40.07 percent of 31 is 12.422 |

40.08 percent of 31 is 12.425 |

40.09 percent of 31 is 12.428 |

40.1 percent of 31 is 12.431 |

40.11 percent of 31 is 12.434 |

40.12 percent of 31 is 12.437 |

40.13 percent of 31 is 12.44 |

40.14 percent of 31 is 12.443 |

40.15 percent of 31 is 12.447 |

40.16 percent of 31 is 12.45 |

40.17 percent of 31 is 12.453 |

40.18 percent of 31 is 12.456 |

40.19 percent of 31 is 12.459 |

40.2 percent of 31 is 12.462 |

40.21 percent of 31 is 12.465 |

40.22 percent of 31 is 12.468 |

40.23 percent of 31 is 12.471 |

40.24 percent of 31 is 12.474 |

40.25 percent of 31 is 12.478 |

40.26 percent of 31 is 12.481 |

40.27 percent of 31 is 12.484 |

40.28 percent of 31 is 12.487 |

40.29 percent of 31 is 12.49 |

40.3 percent of 31 is 12.493 |

40.31 percent of 31 is 12.496 |

40.32 percent of 31 is 12.499 |

40.33 percent of 31 is 12.502 |

40.34 percent of 31 is 12.505 |

40.35 percent of 31 is 12.509 |

40.36 percent of 31 is 12.512 |

40.37 percent of 31 is 12.515 |

40.38 percent of 31 is 12.518 |

40.39 percent of 31 is 12.521 |

40.4 percent of 31 is 12.524 |

40.41 percent of 31 is 12.527 |

40.42 percent of 31 is 12.53 |

40.43 percent of 31 is 12.533 |

40.44 percent of 31 is 12.536 |

40.45 percent of 31 is 12.54 |

40.46 percent of 31 is 12.543 |

40.47 percent of 31 is 12.546 |

40.48 percent of 31 is 12.549 |

40.49 percent of 31 is 12.552 |

40.5 percent of 31 is 12.555 |

40.51 percent of 31 is 12.558 |

40.52 percent of 31 is 12.561 |

40.53 percent of 31 is 12.564 |

40.54 percent of 31 is 12.567 |

40.55 percent of 31 is 12.571 |

40.56 percent of 31 is 12.574 |

40.57 percent of 31 is 12.577 |

40.58 percent of 31 is 12.58 |

40.59 percent of 31 is 12.583 |

40.6 percent of 31 is 12.586 |

40.61 percent of 31 is 12.589 |

40.62 percent of 31 is 12.592 |

40.63 percent of 31 is 12.595 |

40.64 percent of 31 is 12.598 |

40.65 percent of 31 is 12.602 |

40.66 percent of 31 is 12.605 |

40.67 percent of 31 is 12.608 |

40.68 percent of 31 is 12.611 |

40.69 percent of 31 is 12.614 |

40.7 percent of 31 is 12.617 |

40.71 percent of 31 is 12.62 |

40.72 percent of 31 is 12.623 |

40.73 percent of 31 is 12.626 |

40.74 percent of 31 is 12.629 |

40.75 percent of 31 is 12.633 |

40.76 percent of 31 is 12.636 |

40.77 percent of 31 is 12.639 |

40.78 percent of 31 is 12.642 |

40.79 percent of 31 is 12.645 |

40.8 percent of 31 is 12.648 |

40.81 percent of 31 is 12.651 |

40.82 percent of 31 is 12.654 |

40.83 percent of 31 is 12.657 |

40.84 percent of 31 is 12.66 |

40.85 percent of 31 is 12.663 |

40.86 percent of 31 is 12.667 |

40.87 percent of 31 is 12.67 |

40.88 percent of 31 is 12.673 |

40.89 percent of 31 is 12.676 |

40.9 percent of 31 is 12.679 |

40.91 percent of 31 is 12.682 |

40.92 percent of 31 is 12.685 |

40.93 percent of 31 is 12.688 |

40.94 percent of 31 is 12.691 |

40.95 percent of 31 is 12.694 |

40.96 percent of 31 is 12.698 |

40.97 percent of 31 is 12.701 |

40.98 percent of 31 is 12.704 |

40.99 percent of 31 is 12.707 |