# Using and Building on Doubles: 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

Using Doubles is a mental math strategy that involves using what students know about addition doubles (5+5, 3+3, etc.) in order to solve subtraction equations such as 12-6=___. Building on Doubles takes this one step further and utilizes near doubles addition strategies such as "Doubles Plus One" in order to solve a subtraction equation such as 13-6=___.

It is imperative that students have a good understanding of the addition strategies of "Doubles" and "Double Plus One" before learning these subtraction strategies. It is well worth your time to ensure that students have an excellent grasp of the addition strategies before beginning the corresponding subtraction strategies.

This mental math strategy pack includes materials and printables that will help your students learn and practice the mental math subtraction strategies of using doubles and building on doubles. 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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