Think Addition
14 - 8
*Think: 8 plus what makes 14?
Counting Up
17 - 9
Stick 9 in your head, then count up.
*Think: 9.... 10, 11, 12, 13, 14, 15, 16, 17.
I counted up 8 numbers. The answer is 8.
Subtract to 10 (The Number Line strategy - also good for mental math)
16 - 7
*Think: 16 - 6 is 10.
10 - 3 is 7.
I subtracted 6 and then I subtracted 3 more.
16 - 7 = 9.