Lesson 6

Paper-and-Pencil Subtraction:
Compact Method

Est. Class Sessions: 2–3

Daily Practice and Problems

Teacher Notes
X

Have 200 Charts, base-ten pieces, and desk number lines readily available.

Possible strategies:

67 = 60 + 7 = 50 + 17
38 = 30 + 8 = 30 +  8 
20 +  9 = 29

I thought about a number line. 67 − 37 = 30. I need to subtract 1 more.
So, 67 − 38 = 29.

V. More Than One Way

Solve the problem 67 − 38 two ways.