Mental Math: Using Compensation Strategy

The video tutorial introduces the compensation strategy for mental addition, demonstrating how to solve 18 plus 15 by adjusting numbers to make calculations easier. It explains the relationship between numbers using cards and models the problem with ten frames. The tutorial provides a step-by-step solution using compensation, showing that taking 2 from 15 and adding it to 18 results in the same sum. It concludes by explaining the concept of sum equivalence, emphasizing that adjusting addends does not change the total.

What is the main strategy discussed for mental addition?

• Multiplication

• Subtraction

• Compensation

• Division

What is the purpose of using compensation in addition?

• To make numbers easier to add

• To make numbers larger

• To avoid using numbers

• To learn multiplication

What is the adjusted number when 2 is added to 18 in the example?

• 18

• 22

• 16

• 20

What is the result of 15 minus 2 in the compensation process?

• 11

• 14

• 17

• 13

How do you break apart the number 13 in the example?

• 5 + 8

• 6 + 7

• 9 + 4

• 10 + 3

What is the sum of 20 plus 13 after using compensation?

• 33

• 43

• 30

• 23

Does transferring 2 from one number to another in compensation change the total sum?

• Yes, it increases

• Cannot be determined

• No, the sum remains the same

• Yes, it decreases

What does the final sum of 18 plus 15 demonstrate about the compensation strategy?

• It suggests a need for subtraction

• It indicates no change in strategy

• It shows the strategy fails

• It validates the strategy