1) 15 + 1 = 16
2) 14 + 2 = 16
3) 13 + 3 = 16
4) 12 + 4 = 16
5) 11 + 5 = 16
6) 10 + 6 = 16
7) 9 + 7 = 16
8) 8 + 8 = 16
There are 8 pairs since "0" is not counting number.
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The factor pairs of 20 are pairs of numbers that can be multiplied together to give 20. The factor pairs of 20 are (1, 20), (2, 10), and (4, 5). These pairs represent all the possible combinations of numbers that can be multiplied to equal 20.
121 - 16 = 105. There are two other pairs.
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There are infinitely many pairs. Two examples are 55000 and 55000, or 100000 and 10000.
55 can be divided by 1, 5, 11, and 55. These are the factors of 55, which are numbers that can divide evenly into 55 without leaving a remainder. Factors are pairs of numbers that multiply together to give the original number, in this case, 55.