Three-Digit Addition and Subtraction

6.7 3-digit subtraction regrouping tens

By Sandy AlMahsiri

Poll

On a scale of 1-4, how would you rate your understanding when subtracting 3-digit numbers?

• I have a lot to learn

• I know a lot but need help

• I think I know how but need a little help

• I know

Multiple Choice

H T O ​

6 9 5​

-​ 3 2 3

Step1: look at the ones. do you have

​ enough ones to subtract

• yes

• no

Multiple Choice

Find the difference

H T O ​

6 9 5​

-​ 3 2 3

• 978

• 378

• 372

• 1018

Multiple Choice

Step1: look at the ones. do you have

​ enough ones to subtract

7 9 5

- 2 6 6

• yes

• no

Draw

Step1: look at the ones. do you have

​ enough ones to subtract

rgroup one ten as ten ones

7 9 5

- 2 6 6

Step 2: subtract the ones

step 3: subtract the tens

step 3 subtract the hundreds

Multiple Choice

5 6 4

- 3 2 1

Do you need to regroup?

• I need to regroup

• No need to regroup

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