Adding and Subtracting Within 20
Grade 1st Grade · Math · 15 min· Ccss 1.oa.c.6
What's Included
Learning Objective
I can add and subtract within 20 using different strategies.
Warm-Up Video
Math & Learning Videos 4 Kids · 5:02
Addition and Subtraction Strategies 1st Grade Math - Commutative and Associative Property
Guided Notes
3 key 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.
Practice Questions
3 questions · Multiple choice & Short answer
Exit Ticket
Quick comprehension check
“If 5 + 3 = 8, then what number + 5 = 8?”
Complete Lesson Package
Get all 3 ready-to-use resources:
Teacher GuideComplete lesson plan
Student DocPrintable student handouts
SlidesReady-to-use presentation
