Subject
Grade
Concept/Content
addition and subtraction to 20 (understanding of operation and process)
Elaboration
- decomposing 20 into parts
- mental math strategies:
- counting on
- making 10
- doubles
- Addition and subtraction are related.
- whole-class number talks
- nature scavenger hunt in Kaska Counting Book (yukon-ed-show-me-your-math.wikispaces.com/file/detail/Kaska Counting Book.pdf)
keywords
addition and subtraction to 20