Eureka_Module5_Lesson13_Concept Development

Eureka_Module5_Lesson13

Concept Development

Objective: Relate manipulative representations to the subtraction

algorithm, and use addition to explain why the subtraction method works.

Multiple Choice

1. Solve using mental math.

a. 8 - 6 = _____/ 80 - 60 = _____ /180 - 60 = ____ /180 - 59 = ____

• 2 / 20 / 120 / 121

• 3 / 40 / 140 / 119

• 2 / 30 / 110 / 131

Multiple Choice

1. Solve using mental math.

b. 6 - 3 = __ / 60 - 30 = ___ / 760 - 30 = __ / 760 - 28 = ___

• 9 / 80 / 720 / 721

• 9 / 90 / 730 / 731

• 7 / 90 / 710 / 731

Multiple Choice

2. Solve using mental math or vertical form with place value disks. Check your work

using addition.

a. 138 - 17 = 121

• 138-17= 121 / 121 +17 = 138

• 138 - 17 = 111 / 111 +17 = 138

Multiple Choice

Solve using mental math or vertical form with place value disks. Check your work using addition. 863 - 170 =

• 693

• 633

Multiple Choice

Solve using mental math: 445-35

• 475

• 410