The numbers are 21, 22, 23, 24, and 25.
51
21, 22, 23, 24
1209
An infinite number if you can use positive and negative numbers.
You line up the last numbers and then add it!
Two-digit prime numbers whose digits add up to 10 are:193773
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.
25
what two factors of -21 add up to -6
44 62 35 17 26 53 Six numbers add up to 8
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.
21, 51, 81, 91.
20 and 21
21
28