Subtraction Strategies and Concepts

The video tutorial covers unit two, lesson S, focusing on two-digit subtraction with regrouping. The teacher explains the strategy of subtracting ones first, then tens, using various story problems involving stickers, beads, shells, candy, and paper. The lesson emphasizes the importance of regrouping when the top number is smaller than the bottom number in the ones place. The strategy is consistent with addition methods learned previously and will be useful for future lessons on three-digit subtraction.

What is the main focus of this week's lesson?

• Two-digit multiplication

• Three-digit subtraction with regrouping

• Two-digit subtraction with regrouping

• Two-digit addition with regrouping

Which strategy is emphasized for subtraction in this lesson?

• Subtracting ones first, then tens

• Subtracting tens first, then ones

• Adding tens first, then ones

• Adding ones first, then tens

What is the first step in the subtraction strategy discussed?

• Add tens first

• Subtract ones first

• Add ones first

• Subtract tens first

What should you do if the top number in the ones place is smaller than the bottom number?

• Subtract directly

• Borrow a ten from the tens place

• Add a ten

• Multiply the numbers

In the subtraction strategy, what do you do after subtracting the ones?

• Multiply the tens

• Divide the tens

• Add the tens

• Subtract the tens

What should you do if the top number in the tens place is larger than the bottom number?

• Multiply the numbers

• Add a ten

• Borrow a ten

• Subtract directly

In the problem about Sarah's stickers, what is the total number of stickers?

• 46

• 64

• 27

• 19

How many stickers are of dogs in Sarah's problem?

• 19

• 27

• 46

• 64

What is the first step in solving Sarah's sticker problem?

• Multiply the numbers

• Subtract the ones first

• Subtract the tens first

• Add the numbers

What is the final answer for the number of cat stickers Sarah has?

• 19

• 27

• 46

• 64