Regroup a Ten as Ones

What does it mean to subtract something?

• add it
• take it away

How do you regroup a ten?

• move one ten to the ones column
• move the ones to the tens column
• change all tens to ones

If 25 - 10 = 15

What must 15 + 10 = ?

• 25

• 35

• 45

• 23

Do you need to regroup tens as ones when trying to solve 47-19?

• Yes you need to regroup

• No you don't need to regroup

How many ones are in 1 ten?

• 9

• 10

• 8

Fill in the blank

You can _____ 1 ten into 10 ones when subtracting

• Sum

• Regroup

• Add

• Addends

40 bats flew in the cave. 20 flew out. How many were still in the cave?

• 40+ 4 = 14

• 40 - 20 = 20

• 30 - 6 = 4

• 44 = 10 + 6

The girl had 15 pets. The 13 dogs were outside. How many cats did she have? What number sentence tells the story?

• 15-13=2

• 13-12=1

• 15+13=8

• 13 = 15+12