3 + 1 is one more than 3
3 + 1 is (bell) 4
4 + 1 is one more than 4
4 + 1 is (bell) 5
5 + 1 is (bell) 6, 6 + 1 (bell) is 7
7 + 1 is (bell) 8, 8 + 1 (bell) is 9
One more, one less
If you can count you can add and subtract
Count forward to add and backwards to subtract
9 - 1 is one less than 9
9 - 1 is (bell) 8
8 - 1 is one less than 8
8 - 1 is (bell) 7
7 - 1 is (bell) 6, 6 - 1 is (bell) 5
5 - 1 is (bell) 4, 4 - 1 is (bell) 3
One more, one less
If you can count you can add and subtract
Count forward to add and backwards to subtract