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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 Adding To Subtract e.g. 45 - 27 = (45+3 = 48) - (27+3=30) = 18 Number Bonds To 100 (with blank number lines) 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 2-digit + 2-digit - regrouping e.g. 47 + 16 2-digit + 1-digit - no regrouping e.g. 34 + 5 2-digit + 2 -digit - no regrouping e.g. 42 + 36 Number bonds to 20 e.g.8 + ___ = 20 Number bonds to 30 e.g.26 + ___ = 30