Mental Math Strategy: Compensation

This video tutorial introduces the mental math strategy of compensation, focusing on addition. It explains how to make numbers more 'friendly' by adjusting addends to simplify calculations. The video provides six examples, demonstrating how to apply compensation by either adding or subtracting from one addend and performing the opposite operation on the other. This method helps in calculating sums mentally with ease.

What is the main focus of the compensation strategy discussed in the video?

• Addition

• Multiplication

• Division

• Subtraction

In the example 49 + 25, what number is added to 49 to make it more friendly?

• 2

• 5

• 1

• 3

When adjusting the addends in 27 + 38, what operation is performed on 27?

• Subtract 3

• Add 3

• Subtract 2

• Add 2

In the example 76 + 15, what is the new sum after making 76 more friendly?

• 85

• 90

• 91

• 95

What is the first step in making 32 more friendly in the example 32 + 59?

• Subtract 2

• Add 2

• Subtract 3

• Add 3

In the example 21 + 89, what is the result of the first step?

• 22

• 21

• 19

• 20

What is the equivalent sum of 21 + 89 after applying compensation?

• 120

• 130

• 100

• 110

In the example 73 + 19, what operation is performed on 73?

• Add 3

• Subtract 3

• Subtract 1

• Add 1

What is the new sum of 73 + 19 after making 73 more friendly?

• 94

• 90

• 96

• 92

What is the purpose of the compensation strategy in mental math?

• To use a calculator

• To increase the number of steps

• To simplify mental calculations

• To make calculations more complex