# Structures of Addition and Subtraction Problems

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It's no secret that students have a hard time with word problems. They can know how to add and subtract fluently, but if they can't choose the correct operation in a word problem, then they're sunk.

The problem is that we typically only teach the most basic addition and subtraction structures: joining to find the total and taking away to find what's left.

Did you know there are ELEVEN different structures for addition and subtraction problems? This unit includes a chart describing all the structures and 12 story mats using 4 different scenarios (3 mats for each scenario) with sentence frames to help your kiddos understand the different structures in a very concrete way. Examples of each of the 11 structures are included to help guide your instruction.

Common Core Alignment
K.OA.1- represent addition and subtraction with objects, fingers, mental images, etc.
K.OA.2-solve addition and subtraction word problems, and add and subtract within 10
1.OA.1-use addition and subtraction within 20 to solve word problems involving situation of adding to, taking from, putting together, taking apart, and comparing, with unknown in all positions
1.OA.8-determine the unknown whole number in an addition of subtraction equation relating three whole numbers. (eg. 8 + ? = 11)

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17 pages
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