Regrouping Ones into Tens: A Deep Dive

What is the first step in solving a double-digit addition problem with regrouping?

• Write down the numbers

• Use a calculator

• Draw a picture

• Say the numbers out loud

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

How do you represent the number 17 using base ten blocks?

• 1 long and 10 cubes

• 2 longs and 7 cubes

• 17 cubes

• 1 long and 7 cubes

Tags

CCSS.1.NBT.B.2B

CCSS.1.NBT.B.2C

What is the purpose of regrouping in double-digit addition?

• To make a group of ten

• To make the numbers smaller

• To make the numbers larger

• To make the problem easier

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What should you do if you have more than nine cubes in a column?

• Regroup them into a group of ten

• Leave them as they are

• Remove some cubes

• Add more cubes

Tags

CCSS.1.NBT.B.2B

CCSS.1.NBT.B.2C

How many cubes do you need to regroup into a new family member?

• 20

• 15

• 10

• 5

Tags

CCSS.2.OA.A.1

What do you do with the group of ten cubes after regrouping?

• Add them to the next column

• Throw them away

• Put them aside

• Leave them on the mat

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

How many longs do you have after regrouping 10 cubes?

• One

• Two

• Three

• Four

Tags

CCSS.1.NBT.B.2B

CCSS.1.NBT.B.2C

What is the final answer to the addition problem 17 + 7?

• 26

• 23

• 24

• 25

Tags

CCSS.2.OA.A.1

Why do we carry over the one in traditional addition?

• To make the problem easier

• To keep the numbers small

• Because it represents a group of ten

• To confuse students

Tags

CCSS.2.NBT.B.7

What is the sum of 7 + 7 in the context of this problem?

• 12

• 14

• 13

• 15

Tags

CCSS.1.OA.A.1