Regrouping

Use one of these to solve

72-19

Mathematical Equivalence

ON

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Using the strategies try solving

72-17

Mathematical Equivalence

ON

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Why can you not subtract the 5 from the 3?

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What would this make the 3?

Tags

CCSS.1.OA.A.1

What is 13 ones minus 5 ones

Tags

CCSS.6.EE.A.1

Will this give you the same answer?

• yes
• no

• who knows

• what is this magic?

Tags

CCSS.2.OA.A.1

Using the strategies try solving

72-17

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

Now try

123-64

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2