Add and Subtract with Regrouping Review

Which number is the largest?

• 9

• 99

• 143

Trading 10 ones for 1 ten is called _________.

• regrouping

• numbers

• subtracting

How many ones do we have?

How many hundreds' blocks do we have?

Did this problem require regrouping?

• yes

• no

Subtraction is also called finding the ____________ .

• sum

• difference

• product

What should we do next?

• regroup

• add

• divide

How many ones do we have left?

What happened in the tens place?

• We took a group of ten from the tens place.

• We made a mistake somewhere.

• We added the numbers in the tens place.

Can we take away 5 tens from 1 ten?

• No. We should give up.

• Yes. You will get 4.

• Yes. You will need to regroup or take from the hundreds' place.