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Q: How do you make the number 21 using four 4's?

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21 3,7

The number 21 has only four factors: 1, 3, 7, and 21. Many number have more than four factors. Among them are 1x2x3x4x5 = 120.

One possible solution is: 4.4 + 4 / .4 = 21

As a number it is: 21,064

21 = 31*71

21+3 or using all the numbers: 21 + (3*(2-1))

4+2+1=7 7*3=21

There is no such number.

Sherry by The Four Seasons

21-2*2-14

The number 21 is odd since it cannot be divided by two to make a whole number.

5

20 and 1

(23-21) x 22-20

Four sevenths of 21 is 12.

23

The first four multiples of 21: 21, 42, 63, 84

21

25

21 and 4/10 = 21.4 as a decimal number

The Answer is 26

They are: 23 29 31 and 37 which makes four of them

You can add 22 + 2.

The larger number is 12.

The question does not make sense. 21/16 is one number: there is no second number in which it needs to go.