3 Digit Addition and Subtraction Practice

Mrs. McGrath reviews three-digit addition and subtraction, focusing on the traditional stacking method. The video includes practice problems for both addition and subtraction, emphasizing the importance of starting calculations from the ones place. The tutorial also introduces poems to help remember regrouping rules.

Where do we start when adding or subtracting numbers?

• In the tens place

• In the hundreds place

• In the ones place

• At the end of the number

What is the sum of 425 + 132?

• 567

• 527

• 547

• 557

How do we handle carrying over when a sum exceeds 9 in the ones place?

• Subtract 10 from the sum

• Start from the tens place

• Ignore the carry over

• Move to the next highest place value

What is the sum of 458 + 213?

• 661

• 671

• 691

• 681

What is the sum of 567 + 357?

• 944

• 914

• 934

• 924

What mnemonic helps us remember the subtraction process?

• Less on top, no need to stop; equal amounts, mountains surmount

• More on the floor, open the door; less in the sky, let it fly

• More on top, don't stop; more on the floor, go next door

• Numbers the same, zero's the game; less on top, shop nonstop

What is the difference between 465 and 132?

• 353

• 343

• 323

• 333

How do we handle borrowing in subtraction?

• Subtract 10 from the lower place value

• Ignore the need to borrow

• Increase the next highest place value by one

• Decrease the next highest place value by one

What is the difference between 672 and 216?

• 476

• 466

• 456

• 446

What is the difference between 765 and 477?

• 288

• 308

• 278

• 298