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The Addition and subtraction Flashcard shown above is aligned with standard 2NBT05 taken from the Common Core Standards For Mathematics (see the extract below) as are the resources listed below.

*Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction. *

- Addition with making 20 e.g. 18 + 7 = 25
- Addition with making multiples of 10 e.g. 66 + 8 = 74

- Making (Bridging) Multiples of 10 e.g. 17 + 5, 78 + 7

- Number bonds to 20 e.g.8 + ___ = 20
- Number bonds to 30 e.g.26 + ___ = 30
- Number bonds to 40 e.g.12 + ___ = 40
- Number bonds to 50 e.g.17 + ___ = 50
- Number bonds to 100 e.g. 43 + ___ = 100
- Number Bonds To 100 (with blank number lines)

- Adding To Subtract e.g. 45 - 27 = (45+3 = 48) - (27+3=30) = 18

- 2-digit & 1-digit - no regrouping e.g. 34 + 5, 56 - 4
- 2-digit numbers - no regrouping e.g. 42 + 36, 34 + 12
- 2-digit numbers - regrouping e.g. 47 + 16, 78 - 29
- 2-digit - 1-digit - no regrouping e.g. 68 - 5
- 2-digit - 1-digit - regrouping e.g. 65 - 7
- 2-digit - 2 -digit - no regrouping e.g. 86 - 43
- 2-digit - 2-digit - regrouping e.g. 57 - 39