Compensation Strategy in Subtraction

The video tutorial introduces the compensation strategy for subtraction, which simplifies problems by adjusting numbers to make mental calculations easier. It explains why this method works, using simple examples like 8 minus 5, and demonstrates its application to larger numbers, such as 54 minus 29 and 66 minus 28. The strategy involves adding the same amount to both numbers to maintain the difference, making subtraction more manageable.

What is the main goal of the compensation strategy in subtraction?

• To solve subtraction problems using a calculator

• To make subtraction problems more complex

• To simplify subtraction problems for mental calculation

• To convert subtraction problems into addition problems

In the compensation strategy, what happens to the difference when the same amount is added to both numbers?

• The difference becomes zero

• The difference remains the same

• The difference decreases

• The difference increases

Why is 8 minus 5 used as an example in explaining the compensation strategy?

• Because it is an addition problem

• Because it is a simple problem to illustrate the concept

• Because it is a complex problem

• Because it involves large numbers

What is the result of adding 2 to both numbers in the example 8 minus 5?

• The numbers become 14 and 11

• The numbers become 12 and 9

• The numbers become 6 and 3

• The numbers become 10 and 7

What is the result of 10 minus 7 in the compensation example?

• 2

• 3

• 4

• 5

What is the first step in using the compensation strategy?

• Add the same amount to both numbers

• Add a random number to both numbers

• Subtract a random number from both numbers

• Subtract the same amount from both numbers

In the problem 54 minus 29, what is the first step in applying the compensation strategy?

• Divide both numbers by 2

• Subtract 10 from both numbers

• Add 1 to both numbers

• Multiply both numbers by 2

After applying the compensation strategy to 54 minus 29, what is the new problem?

• 52 minus 27

• 53 minus 28

• 55 minus 30

• 56 minus 31

Why is a tape diagram used in the problem 54 minus 29?

• To visually represent the numbers

• To make the problem more difficult

• To solve the problem using algebra

• To convert the problem into an addition problem

What is the result of 55 minus 30?

• 35

• 20

• 30

• 25