Add Multiples of 10 using the Make 100 Strategy 2-84

Add multiples of 10 by generalizing from the Make 10 strategy to the Make 100 strategy. What's 80+60? First make 100, then add the rest. Think of 60 as 20 and 40. Since 80+20 = 100 and 100+40 = 140, 80+60 = 140. Start by modeling numbers concretely with Base 10 discs and ten frames. Transition to number bonds.

 
 

1. Learn

play_circle_outline

Add multiples of 10 by generalizing from the Make 10 strategy to the Make 100 strategy. What's 80+60? First make 100, then add the rest. Think of 60 as 20 and 40. Since 80+20 = 100 and 100+40 = 140, 80+60 = 140. Start by modeling numbers concretely with Base 10 discs and ten frames. Transition to number bonds.

star_border

2. Practice

Lesson
2-84
Lesson
2-84
Lesson
2-84
star_border

3. Apply

POD
2-84
POD
2-84
POD
2-84
star_border