Adding and Subtracting Within 20
1st GradeMath15 min
aligned to Ccss 1.oa.c.6
Learning Objective
I can add and subtract within 20 using different strategies.
Lesson Flow
Watch Video
Addition and Subtraction Strategies 1st Grade Math - Commutative and Associative Property
Math & Learning Videos 4 Kids
Guided Notes
Key concepts students will learn:
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The commutative property states that in addition, numbers can be switched around and the answer will still be the same.
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In the math mountain example, the total is at the top, and the partners or addends are at the bottom.
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When adding more than two numbers, it can be helpful to make groups of doubles or tens to simplify the problem.
Practice
3 questions • Multiple choice & Short answer
Exit Ticket
“If 5 + 3 = 8, then what number + 5 = 8?”
Teacher Guide
Get the complete package:
- Answer keys for all questions
- Differentiation strategies
- Extension activities
- Printable student handouts
