Adding up to 4 double digit numbers with regrouping

Add the following using a hundreds chart: 12+7

• 17

• 18

• 19

• 20

Add the following using a hundreds chart: 37+29

• 56

• 66

• 76

• 8

Show the following using base ten blocks: 10+10+5+5

• SHOW MRS. TORRES ON YOUR DESK

• SHE WILL SAY CORRECT OR INCORRECT

Solve the following using base-ten blocks: 23+12+17=

• 52

• 51

• 53

• 54

Solve the following using base-ten blocks: 34+5+17+9

• 5 tens 6 ones

• 56 tens

• 6 tens 5 ones

What does regrouping mean?

• Putting numbers into the same group again

• Changing ones to tens

• Changing addition to subtraction

• Using base ten blocks

Which number is not a digit?

• 1

• 65

• 9

• 3

What skill did you get better at?

• Using a hundreds chart

• Regrouping with addition

• Using base ten blocks

• Checking my answer and fixing errors

What skill do you need more help with?

• Using base ten blocks

• Regrouping with addition

• Checking my work and finding errors

• Using a hundreds chart

Will you need to regroup in the following problem? 72-49

• Yes you will need to regroup because 2 is less than 9.

• No because 9-7=2

• Yes because 4 is less than 7

• No because 7-4=3