Mrs Elisha Noe Subtraction With Double Digits On Top On Bottom
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Transcript of 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!!!!!