Compensation Strategy in Mental Math

This video tutorial introduces the mental math strategy of compensation, focusing on multiplication. It explains how to reformulate multiplication problems to make them easier to solve mentally. The video provides three examples: 48 times 3, 32 times 9, and 27 times 8, demonstrating how to adjust one factor to simplify the calculation and then correct the result to find the original product.

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

• Addition

• Multiplication

• Division

• Subtraction

Tags

CCSS.3.OA.C.7

In the first example, what number is added to 48 to make it easier to multiply by 3?

• 4

• 3

• 2

• 1

Tags

CCSS.3.OA.C.7

After adjusting 48 to 50 in the first example, what is the next step to find the original product?

• Subtract 3

• Add 3

• Subtract 6

• Add 6

Tags

CCSS.3.OA.B.5

In the second example, what number is subtracted from 32 to simplify the multiplication with 9?

• 3

• 1

• 4

• 2

Tags

CCSS.4.NBT.B.5

What is the convenient product obtained after adjusting 32 to 30 in the second example?

• 288

• 300

• 240

• 270

Tags

CCSS.3.OA.D.8

In the second example, what must be done to the convenient product to find the original product?

• Subtract 9

• Add 9

• Subtract 18

• Add 18

Tags

CCSS.3.OA.C.7

In the third example, what number is added to 27 to make it easier to multiply by 8?

• 4

• 3

• 2

• 5

Tags

CCSS.4.NBT.B.5

What is the convenient product obtained after adjusting 27 to 30 in the third example?

• 216

• 270

• 288

• 240

Tags

CCSS.7.NS.A.2A

In the third example, what must be done to the convenient product to find the original product?

• Add 24

• Subtract 24

• Add 16

• Subtract 16

Tags

CCSS.4.NBT.B.5

What is the final product of 27 times 8 using the compensation strategy?

• 200

• 288

• 216

• 240

Tags

CCSS.4.NBT.B.5