Addition Subtraction Mental Math Strategies created by Gr5AH

What is the most effective method for solving this problem: 28+ 99

• partitioning

• bridging

• re-ordering

• compensating

• doubles or doubles +/-1

Tags

CCSS.2.NBT.B.7

28 + 99 =

• 129

• 117

• 127

• 119

What is the most effective method for solving this problem: 73 + 32

• partitioning

• bridging

• re-ordering

• compensating

• doubles or doubles +/-1

Tags

CCSS.2.NBT.B.7

73 + 32

• 105

• 51

• 103

• 95

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What is the most effective method for solving this problem: 32 + 90 + 10 + 8

• partitioning

• bridging

• re-ordering

• compensating

• doubles or doubles +/-1

Tags

CCSS.2.NBT.B.6

32 + 90 + 8 + 10

• 150

• 120

• 130

• 140

Tags

CCSS.4.NBT.B.4

What is the most effective method for solving this problem: 1.6 + 1.7

• partitioning

• bridging

• re-ordering

• compensating

• doubles or doubles +/-1

Tags

CCSS.5.NBT.B.7

1.6 + 1.7

• 2.13

• 33

• 3.3

• 3.2

Tags

CCSS.6.NS.B.3

What are the most effective methods for solving this problem: 5.6 + 1.8

• partitioning

• bridging

• re-ordering

• compensating

• doubles or doubles +/-1

Tags

CCSS.5.NBT.B.7

5.6 + 1.8

• 6.14

• 7.4

• 74

• 57.8

Tags

CCSS.6.NS.B.3