Subtraction with Regrouping -

8 2 -5 3 1. Look at the ones. Ask: “Can we take 3 away from 2?” If we can’t, then we have to regroup.

2. Regroup as needed. 7 8 2 1st: Go next door to the tens and take one away. 1 2nd: Add the ten to the ones. -5 3

3. Subtract the ones. 7 What is 12 – 3? 8 2 1 -5 3 9

4. Subtract the tens. 7 What is 7 – 5? 8 2 1 -5 3 2 9

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.

We can check our subtraction with addition! 7 8 2 2 9 1 +5 3 -5 3 2 9 1st: Move the answer ’29’ to the top of the addition problem. 2nd: Move the subtracted number ’53’ across to complete the addition problem.

8 2 2 9 -5 3 8 2 2 9 7 1 1 Now we’re ready to add… +5 3 1st: Add the ones: 9 + 3 2nd: Regroup the ten. 1 7 8 2 2 9 1 +5 3 -5 3 8 2 2 9 3rd: Add the tens – Don’t forget to add the regrouped one!

Let’s see if we are right… Yes!! They match! We are right! 1 7 8 2 2 9 1 +5 3 -5 3 8 2 2 9 Does the answer of the addition problem ’82’ match the top number of the subtraction problem?

Now it’s your turn to prove you’re the math wizard! Great Job! Now it’s your turn to prove you’re the math wizard!