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Q: What numbers add up to 21 that have 1 digit?

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You line up the last numbers and then add it!

25

21, 21, 21, 21 , 15, 1

None. The only way for it to be possible would be 3 zeros which is not considered a 3 digit numbers.

To make the list of two-digit numbers with digits that add up to 10, first write the pairs of single-digit integers that add up to 10. They are (1,9), (2,8), (3,7), (4,6), (5,5). Then recognize that each of these pairs of numbers, except 5, can be combined in two different ways to make two-digit numbers that satisfy the problem. 19 and 91 28 and 82 37 and 73 46 and 64 55 So there are nine two-digit numbers with digits that add up to 10.

21, 51, 81, 91.

21

20 and 21

51

Two-digit prime numbers whose digits add up to 10 are:193773

28

The numbers are 21, 22, 23, 24, and 25.

59

The numbers are -21 and -20.

341

15710

10

23

21, 22, 23

111

1209

21, 22, 23, 24

An infinite number if you can use positive and negative numbers.

The numbers are: 1 plus square root of 21 and 1 minus square root of 21

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