# Expanding the Subtrahend: A Mental Math Subtraction Strategy Unit

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1. This file includes all of the mental math strategy units in the Complete Addition Collection and the Complete Subtraction Collection. The units in the addition collection include: - Counting On - Doubles - Doubles Plus One - Making Ten - Making Multiples of Ten - Front End Addition The units in t
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2. Interested in purchasing the Addition AND Subtraction Collections? You can save money by purchasing them together. Click on the link below for more details: Mental Math Strategy Units: Addition and Subtraction Combo Pack This zipped file contains all six units in the SUBTRACTION portion of the Ment
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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

Expanding the Subtrahend is a mental math strategy that involves breaking the smaller number (subtrahend) into two more manageable parts. In this unit this strategy will be used with two-digit subtract two-digit equations. For example, in the equation 53-22, the student will learn to break the 22 into a "20" and a "2." So, the first step will be to perform 53-20=33, and then 33-2 to get a difference of 31.

This strategy is particularly important to teach because it will broaden students' sense of number without focusing on the confusing process of "borrowing." Concepts of place value and expanded notation will be reinforced while learning important mental math skills that will transfer to other areas of mathematics.

This mental math strategy unit includes materials and printables that will help teach and reinforce the concept of expanding the subtrahend. Included is independent seat work, flashcards, center activities, large group kinesthetic learning activities and more!

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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