WHY DO I REGROUP AND HOW DO I DO

IT?Let’s find out!

WHAT DO YOU DO WHEN THERE ARE NOT ENOUGH ONES TO SUBTRACT FROM?➤ Let’s make a model!

➤ Now, let’s trade a ten!

➤ Why did we need to regroup?

2 27-

WHY DO WE NEED TO REGROUP?

2 27-

We need to regroup because we don’t have enough ones to take away 7.

There are more ones on the floor.

HOW DO WE REGROUP?

2 27-

We need to regroup by borrowing a ten.

Go next door and get 10 more.

1

HOW DO WE REGROUP?

2 27-

We need to regroup by borrowing a ten.

Go next door and get 10 more.

1 12

NOW WE CAN SOLVE THE PROBLEM

2 27-

We need to subtract the ones first.

12-7 is 5 (11, 10, 9, 8, 7)

1 12

5

NOW WE CAN SOLVE THE PROBLEM

2 27-

Now, we subtract the tens.

1-0 is 1

1 12

50

WHAT DO YOU DO WHEN THERE ARE NOT ENOUGH TENS TO SUBTRACT FROM?

➤ Let’s make a model!

➤ Now, let’s trade a hundred!

2 55-

89

0

WHY DO WE NEED TO REGROUP?

8 55-

We need to regroup because we don’t have enough tens to take away 9 tens.

There are more tens on the floor.

29

0

HOW DO WE REGROUP?

8 55-

We need to regroup by taking 1 hundred and give it to the tens.

Go next door and get ten more.

29

0

1

HOW DO WE REGROUP?

8 55-

We need to regroup by taking 1 hundred and give it to the tens.

Go next door and get ten more.

29

0

1 18

NOW WE CAN FINISH SOLVING

8 55-

We already subtracted the ones, so now we subtract the tens.

18-9= 9 because I know 9+9=18.

29

0

1 18

9

NOW WE CAN FINISH SOLVING

8 55-

We already subtracted the tens, so now we subtract the hundreds.

1-0=1, so the answer is 190

29

0

1 18

901