Add and subtract within 20 using strategies
Skill, addition, level 1-2
Lines up with: 1.OA.C.6, 2.OA.B.2
Builds on
- Changing order or grouping does not change a sum
- Count on from a number instead of counting everything
- Split numbers up to 10 into parts, and find the partner that makes ten
- Subtracting is finding a missing part
Leads to
Lessons
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