Adding by Complements of 10 (Lesson. Worksheet. Slides)

Help students develop addition skills by learning how to quickly add long strings of one-digit numbers. This can be a useful and fun skill for students of any age or skill level. Included is a lesson overview, printable worksheet with answer key and colorful slides to show in the classroom.

Complements of 10 are two numbers that add up to 10, such as

1    and    9

2    and   8

3    and    7

4    and     6

and so on...