Mastering 2-Digit Subtraction with Regrouping

What is the first step in solving the problem?

• Read the problem once.

• Read the problem twice.

• Start subtracting immediately.

• Guess the answer.

Tags

CCSS.1.OA.A.1

What mathematical operation is used in this problem?

• Division

• Addition

• Subtraction

• Multiplication

Tags

CCSS.5.NBT.B.7

Why did we need to perform a fair trade?

• There were too many tens.

• There were not enough ones.

• No need for a fair trade.

• There were too many ones.

Tags

CCSS.RI.6.3

CCSS.RI.6.5

CCSS.RI.8.3

CCSS.RI.8.5

CCSS.RI.9-10.3

How many ones did we get after performing a fair trade?

• 10

• 11

• 9

• 8

Tags

CCSS.1.NBT.B.2B

CCSS.1.NBT.B.2C

What do we need to check after doing a fair trade?

• If we have 87.

• If we still have 88.

• If we have 100.

• If we have 89.

Tags

CCSS.2.NBT.B.5

Before subtracting, what did we need to build?

• The number 49

• The number 88

• The number 39

• The number 100

Tags

CCSS.2.NBT.B.7

How many tens are left after subtracting four tens?

• 4

• 6

• 5

• 3

Tags

CCSS.1.NBT.B.2B

CCSS.1.NBT.B.2C

How many ones did we subtract?

• 9

• 11

• 8

• 10

Tags

CCSS.2.OA.A.1

What is the final answer to how many stamps Andy has left?

• 41

• 40

• 39

• 38

Tags

CCSS.2.OA.A.1

What is the expanded form of the final answer?

• 30 + 8

• 30 + 9

• 40 - 1

• 39 + 0

Tags

CCSS.2.OA.A.1