Mastering 3-Digit Subtraction with Regrouping

Mr. Schneider teaches three-digit subtraction with regrouping. The lesson involves solving a problem where Mrs. Schneider has 531 cookies and gives away 175. The process includes regrouping from hundreds to tens and tens to ones, ensuring enough value to subtract at each step. The final answer is 356 cookies remaining. The video emphasizes understanding regrouping and subtraction through a step-by-step approach.

What is the first step in solving a three-digit subtraction problem?

• Start from the leftmost digit

• Start from the rightmost digit

• Subtract the hundreds first

• Subtract the tens first

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CCSS.2.NBT.B.7

If the digit on the top is smaller than the digit on the bottom in the ones place, what should you do?

• Skip the subtraction

• Subtract directly

• Add ten to the top digit

• Go next door and get ten more

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After regrouping from the tens to the ones place, what should you do with the tens digit?

• Change it to zero

• Decrease it by one

• Increase it by one

• Leave it as it is

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CCSS.2.NBT.B.7

What do you do if you don't have enough tens to subtract from?

• Skip the subtraction

• Add ten to the tens place

• Subtract directly

• Go next door to the hundreds place and get ten more

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How many tens do you get when you regroup one hundred?

• 15 tens

• 20 tens

• 10 tens

• 5 tens

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CCSS.2.NBT.A.1

What should you do with the hundreds digit after regrouping to the tens place?

• Increase it by one

• Decrease it by one

• Leave it as it is

• Change it to zero

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CCSS.2.NBT.A.1

CCSS.2.NBT.B.7

After regrouping, how many tens do you have if you originally had 2 tens and added 10 more?

• 10 tens

• 12 tens

• 14 tens

• 8 tens

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What is the result of subtracting 7 from 12 in the tens place?

• 3

• 6

• 4

• 5

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CCSS.2.NBT.B.5

How many hundreds are left after subtracting 1 from 4?

• 4

• 3

• 2

• 1

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CCSS.2.NBT.B.7

CCSS.2.OA.A.1

What is the final number of cookies Mrs. Schneider has left?

• 175

• 356

• 531

• 400

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CCSS.2.NBT.A.1

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