# Compensation: A Mental Math Subtraction Strategy Unit

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Shelley Gray
Manitoba
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\$4.99

This unit is part of the subtraction portion of the Mental Math Strategy Collection.

To purchase all six subtraction units together and save \$6.95, please view the link below:
Mental Math Units: the Complete Subtraction Collection

Compensation is a mental math strategy that involves changing one number in the equation to make it easier to solve. Subsequently, the answer must be adjusted in order to account for the original change that was made. This strategy is most useful for subtraction equations where the subtrahend is an 8 or a 9.

For example, to solve the equation 15-9, a student could first think "15-10=5." Now, because the student subtracted one too many, one more must be added to the answer to make "6."

When students become comfortable with compensation, they will begin to use similar concepts in other equations and it will carry over to other operations such as addition and multiplication. The most important aspect of compensation is to learn the concept behind it, and you will find that students will use it when appropriate and efficient.

This mental math strategy unit includes materials and printables that will help your students develop an understanding of compensation. Included is independent seat work, flashcards, center activities, large group kinesthetic learning activities and more!

I have also included a Level 2 Bonus Section in this unit which includes some activities that will provide practice with compensation of bigger numbers such as 18, 19, 28 and 29. Teachers may choose to cover Level 2 only with students requiring enrichment, or with the entire class.

Enjoy!
~Shelley Gray

To view the entire Mental Math Strategy Collection, please click on the link below:
Mental Math Strategy Units by Shelley Gray

Additionally, feel free to view my YouTube video on Mental Math Subtraction Strategies by clicking on the link below:
Mental Math Subtraction Strategies on YouTube
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