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Subtraction with Decompositions




 


Videos solutions to help Grade 2 students learn how to use math drawings to represent subtraction with up to two decompositions, relate drawings to the algorithm, and use addition to explain why the subtraction method works.

Common Core Standards: 2.NBT.7, 2.NBT.9

Related Topics:
Common Core Math Resources, Lesson Plans & Worksheets for all grades

Common Core Math Video Lessons, Math Worksheets and Games for Grade 2

Common Core Math Video Lessons, Math Worksheets and Games for all grades

New York State Common Core Math Module 5, Grade 2, Lesson 14, Lesson 15



Topic C: Strategies for Decomposing Tens and Hundreds Within 1,000

NYS Math Module 5 Grade 2 Lesson 14


Lesson 14 Homework

1. Solve by drawing number disks on a chart. Then, use addition to check your work.
b. 463 - 357
d. 861 - 673

NYS Math Module 5 Grade 2 Lesson 15


Lesson 15 Homework

1. Solve by drawing chips on the place value chart. Then, use addition to check your work.
b. 742 – 495
e. 941 – 628

2. Complete all of the if...then statements. Draw a number bond to represent the related facts.
a. If 928 – ________ = 519, then 519 + 409 = _________.
b. If 764 – _______ = 391, then ________ + 391 = 764.




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