Lesson
1.17. Addition and subtraction up to 20 SUMMARY
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1.17. Addition and subtraction up to 20 SUMMARY
Addition and subtraction up to 10
LEVEL 1
- 1.
- 2.
LEVEL 2
- 3.
- 4.
LEVEL 3
- 5.
LEVEL 4
- 6.
Addition and subtraction up to 20 without crossing tens
LEVEL 2
- 7.
- 8.
LEVEL 3
- 9.
- 10.
LEVEL 4
- 11.
- 12.
LEVEL 5
- 13.
Addition and subtraction up to 20 with crossing tens
LEVEL 3
- 14.
- 15.
LEVEL 4
- 16.
- 17.
LEVEL 5
- 18.
- 19.
LEVEL 6
- 20.
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- 23.