Addition and Subtraction Within 20
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Objective
I can solve addition and subtraction problems within 20.
Part 1 of 3
Key concepts
3 concepts
- 1
Adding numbers means putting things together, like when you have 3 apples and get 2 more, you will have 5 apples.
- 2
Subtracting numbers means taking things away, like when you have 5 cookies and eat 1, you will have 4 cookies left.
- 3
We can add and subtract with numbers up to 20, which helps us count many things.
Part 2 of 3
Practice
3 questions
You have 8 red blocks and 7 blue blocks. How many blocks do you have in total?
There are 16 balloons at a party. 5 balloons float away. How many balloons are left?
Part 3 of 3
Exit ticket
Quick comprehension check
“You have 8 crayons. Your teacher gives you 6 more crayons. How many crayons do you have now? Then, you give 4 crayons to your classmate. How many crayons do you have left?”
Sample answer included in the free materials
Get the materials
Teacher guide, student handout, and slides — free, in Google Docs format
Teacher Guide
Complete lesson plan with answer keys and alternate activities
Student Handout
Printable worksheet
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