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Mental Math Addition and Subtraction Strategies Common Core

Powerful Tool!

This flyer can be used:

• • • • • • •

during a parent-teacher conference as a handout in small math groups as a resource for an anchor chart blown up and used placed on a bulletin board laminated and placed in a math center as a handout for students to place in their math notebooks or journals cut apart and used as flash cards 2012 Carolynn Yates

Addition and Subtraction Strategies Branching Strategy for Addition 6 + 3 + 4 + 7 + 2 + 7 = 29

10 + 10

+

9

Level A

Partial Sums Strategy for Addition 78 + 57 70 + 50 = 120 8 + 7 = 15 135

Decomposing Strategy for Addition 78 = 70 + 8 57 = 50 + 7 120 + 15 = 135

Open Number Line Strategy for Subtraction 86 - 28 = ______ or +2

28 + ______ = 86 +40

+10

28 30

40

+6

80

86

2 + 6 + 10 + 40 = 58 2012 Carolynn Yates

Addition and Subtraction Strategies Branching Strategy for Addition 26 + 43 + 54 + 66 = 189 70 +10 + 100 + 9

Level B

Partial Sums Strategy for Addition 378 + 257 300 + 200 = 500 70 + 50 = 120 8 + 7 = 15 635 Open Number Line Strategy for Subtraction 306 - 128 = ______

378 = 300 + 70 + 8 257 = 200 + 50 + 7

128 + ______ = 306 +100

500 + 120 + 15 = 635 128

+2

228 230

+70

+6

300

306

100 + 70 + 6 + 2 = 178 2012 Carolynn Yates