Simple yet
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
Decomposing Strategy for Addition
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