Adding with 10 makes adding with 9 easy!

If 10 + 7 = 17Then9 + 7 must be one less!

Why?Because 9 is one less than 10.9 + 7 = 16

First practice adding with 10…..

10 + 9 =

10 + 4 =

10 + 7 =

10 + 3 =

10 + 8 =

10 + 1 =

10 + 5 =

10 + 2 =

10 + 6 =

Now try adding with 9…..

9 + 5 =

9 + 7 =

9 + 9 =

9 + 1 =

9 + 4 =

9 + 6 =

9 + 8 =