mrs elisha noe subtraction with double digits on top on bottom

You Can SubtractWith and without regrouping!!!!!!!!

Review• What is the addition relationship

to subtraction?– Subtraction is the addition in reverse,

or you can add the answer by the lower number to check your problem!

• What does regrouping mean in subtraction?– When you regroup in a subtraction

problem you borrow 10 from the tens place, and add it to the ones place,

Let’s Learn “The Subtraction Rhyme”

More on top?No need to stop!More on the floor?Go next door!Get one TEN.That’s ten ONES more.Number’s the same?Zero’s the game!!!!!

8 4 -6 9 1 5

7 14

1 6-1 2 4

1 8-1 8 0

Look at it this way

We have two sides that we are working with…..

TENS ONES

What is first? What is next?

1. I always start with my one’s place when subtracting.

2. I have to make sure that I can subtract the bottom number from the top number.

3. If I can, I can go ahead and subtract.4. If I cannot I must REGROUP and

borrow ten from the TENS place.5. Then I add that ten to my ONE’S

place

Always Remember ONE’S side first!

51

This side first.

This side second.

TENS2

1

ONES83

More on Top? No need to stop!

6 6 8 4 -4 4 -3 3

4 9

-2 1

22 15

82

Let’s REGROUP

Remember that you have to work the ONE’S side first, but can we subtract 0-3?TEN

S

52

*No, we have to regroup. We must borrow ten from the tens, and add it to the ones.

ONES

03

4 10

72

Why does this work?TENS ONES

5

2

0

3

410

72

More on the floor? Go next door.

4337

7346

8125

3 13

6

6 13

72

7 11

65

Great JOB!!!!!