Understanding Subtraction Strategies

The video tutorial explains a strategy for learning subtraction by thinking in terms of addition. It introduces the unknown-addend model, which helps students connect addition and subtraction. Through examples, including a picture card and a real-world scenario involving money, the tutorial demonstrates how this strategy simplifies subtraction problems, even with larger numbers.

What is the primary strategy suggested for learning subtraction facts?

• Practicing division

• Thinking in terms of addition

• Using multiplication

• Memorizing subtraction tables

How does knowing addition facts help with subtraction?

• It only helps with multiplication

• It has no effect

• It simplifies the process

• It makes subtraction more complex

In the picture card example, what is the missing part if the total is 12 and the known part is 8?

• 4

• 3

• 6

• 5

What model is used to connect addition and subtraction in the picture card example?

• Unknown-addend model

• Fraction model

• Division model

• Multiplicative model

If you have $106 and spend $89, how much will you have left using the unknown-addend model?

• $18

• $17

• $16

• $15

How does the unknown-addend model help with larger numbers?

• It makes calculations more difficult

• It provides a clear method to find the unknown

• It is only useful for small numbers

• It requires memorization of subtraction facts