with Regrouping 1 Look at the ones Ask Can we take 3 away from 2 8 2 5 3 If we cant then we have to regroup 2 Regroup as needed 8 2 5 3 1 st Go next door to the tens and take one away ID: 499511
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Slide1
Subtraction with Regrouping
-Slide2
1. Look at the ones.Ask:“Can we take 3 away from 2?”
8 2
-
5 3
If we can’t, then we have to regroup.Slide3
2. Regroup as needed.8 2
-5 3
1
st: Go next door to the tens and take one away.
7
2
nd
:
Add the ten to the ones.
1Slide4
3. Subtract the ones.8 2
-5 3
7
1
What is 12 – 3?
9Slide5
4. Subtract the tens.8 2
-5 3
7
1
9
What is 7 – 5?
2Slide6
Now let’s review the steps…Look at the ones. Ask: Can we subtract?Regroup as needed:
1. Go to the tens and take one away. 2. Add the ten to the ones.Subtract the ones.
Subtract the tens.Slide7
We can check our subtraction with addition!8 2
-
5 3
7
1
9
2
2 9
+
5 3
1
st
: Move the answer ’29’ to the top of the addition problem.
2
nd
: Move the subtracted number ’53’ across to complete the
addition problem.Slide8
Now we’re ready to add…8 2
-5 3
7
1
9
2
2 9
+
5 3
3rd: Add the tens –
1st:
Add the ones: 9 + 3
2
nd
:
Regroup the ten.
2
1
8
Don’t forget to add the regrouped one!Slide9
Let’s see if we are right…8 2
-5 3
7
1
9
2
2 9
+
5 3
2
1
8
Does the answer of the addition problem ’82’
match the top number of the subtraction problem?
Yes!!
They match!
We are right!Slide10
Great Job!
Now it’s your turn to prove you’re the math wizard!