Understanding Subtraction Equations: Why We Can't Reverse Them

Resource Type
Common Core Standards
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PDF (Acrobat) Document File

2 MB|13 pages
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Product Description
Within this product, you will find the items I use in my own classroom to help students make sense of subtraction number sentences, and to lead them to the discovery of the fact that subtraction number sentences must always start with the bigger number.

In the student activity, students will be rolling numbers for the equations; this helps the practice to feel more like a ‘game’ rather than just worksheet practice.

I teach this lesson so that I can build toward the understanding of CCSS.Math.Content.1.OA.B.3 [Apply properties of operations as strategies to add and subtract.2 Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition)].

Including this lesson first will help students to understand why this concept works for addition, but not subtraction. If you are interested in the sequence of lessons that helped to build up to this particular lesson, or the lessons that follow, please see my store or contact me.

Included in this product:
Suggested lesson outline
Vocabulary cards to match lesson
Non-examples for lesson discussion
Student activity sheet
Exit Ticket
Number card sets, in case you don’t have number cubes or dice

However you use this lesson/activity set for making sense of subtraction number sentences, I genuinely hope that you find these materials helpful in your classroom!

Happy teaching & happy learning.

Ridiculum Curriculum
Total Pages
13 pages
N/A
Teaching Duration
50 minutes
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