Mastering Multi-Digit Addition and Subtraction

This video tutorial covers the basics of adding and subtracting multi-digit numbers using the stack method. The instructor explains the importance of stacking numbers to simplify the process and demonstrates this with examples. The video also addresses common issues like regrouping and borrowing, providing clear examples with both small and large numbers. The tutorial concludes with tips for effectively using the stack method in various scenarios.

Why is it important to stack numbers when adding or subtracting multi-digit numbers?

• It makes the process faster.

• It is a traditional method.

• It helps to align the digits correctly.

• It makes the numbers look bigger.

What is the result of adding 48 and 39 using the stack method?

• 97

• 107

• 87

• 77

When adding 48 and 39, what do you do after getting 17 from 8 plus 9?

• Write down 1 and carry over 7.

• Write down 7 and carry over 1.

• Write down 17 directly.

• Write down 8 and carry over 9.

What is the first step when subtracting 39 from 48 using the stack method?

• Subtract 9 from 8 directly.

• Subtract 3 from 4 directly.

• Borrow from the tens place.

• Add 1 to the ones place.

What is the result of subtracting 39 from 48 using the stack method?

• 19

• 39

• 9

• 29

What is the result of adding 481 and 68 using the stack method?

• 569

• 579

• 559

• 549

When adding 481 and 68, what do you do after getting 14 from 8 plus 6?

• Write down 1 and carry over 4.

• Write down 8 and carry over 6.

• Write down 4 and carry over 1.

• Write down 14 directly.

What is the first step when subtracting 68 from 481 using the stack method?

• Subtract 8 from 1 directly.

• Borrow from the tens place.

• Add 1 to the ones place.

• Subtract 6 from 4 directly.

What is the result of subtracting 68 from 481 using the stack method?

• 443

• 413

• 423

• 433

What is a key recommendation for adding and subtracting multi-digit numbers?

• Avoid carrying over numbers.

• Always use a calculator.

• Stack the numbers to align the digits.

• Write the numbers horizontally.