Adding and Subtracting Within 20
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Objective
I can add and subtract within 20 using different strategies.
Part 1 of 4
Warm-up video
Math & Learning Videos 4 Kids · 5:02
We don't generate video — this one is by Math & Learning Videos 4 Kids on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.
Part 2 of 4
Key concepts
3 concepts
- 1
The commutative property states that in addition, numbers can be switched around and the answer will still be the same.
- 2
In the math mountain example, the total is at the top, and the partners or addends are at the bottom.
- 3
When adding more than two numbers, it can be helpful to make groups of doubles or tens to simplify the problem.
Part 3 of 4
Practice
3 questions
If 5 + 3 = 8, then what does 3 + 5 equal?
If 7 - 2 = 5, then what does 7 - 5 equal?
Part 4 of 4
Exit ticket
Quick comprehension check
“If 5 + 3 = 8, then what number + 5 = 8?”
Sample answer included in the free materials
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Teacher guide, student handout, and slides — free, in Google Docs format
Teacher Guide
Complete lesson plan with answer keys and alternate activities
Student Handout
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