What are the digits that add up to 10?

Answer 1

The digits that add up to 10 are 1 and 9, 2 and 8, 3 and 7, and 4 and 6. This is because when you add these pairs of digits together, they equal 10. For example, 1 + 9 = 10, 2 + 8 = 10, and so on. These pairs are known as complementary pairs in mathematics.

Answer 2

Using two positive integers to add up to 10:

1 + 9
2 + 8
3 + 7
4 + 6
5 + 5
6 + 4
7 + 3
8 + 2
9 + 1