Subtraction with Regrouping for 2nd Graders

How many students got off the bus at the first stop?

• 12

• 17

• 20

• 25

What does the '4' in the number 45 represent?

• 4 ones

• 4 tens

• 40 ones

• 40 tens

How many ones blocks are needed to represent the number 45?

• 4

• 5

• 10

• 15

Why can't we subtract 7 ones from 5 ones?

• Because we need more tens

• Because 7 is less than 5

• Because 5 is more than 7

• Because we don't have enough ones

What do we need to do when we don't have enough ones to subtract?

• Subtract tens instead

• Add more ones

• Skip the subtraction

• Regroup tens to ones

After regrouping, how many ones blocks do we have?

• 15

• 10

• 5

• 20

How many ones are left after subtracting 7 from 15?

• 9

• 6

• 7

• 8

Why do we change the number of tens from 4 to 3?

• Because we regrouped a ten to ones

• Because we made a mistake

• Because we subtracted a ten

• Because we added more ones

What is 3 tens minus 1 ten?

• 4

• 3

• 2

• 1

How many students are left on the bus after the subtraction?

• 18

• 28

• 20

• 25