1


Big Idea 1  Strategies for Addition and Subtraction






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Big Idea 2  Addition and Subtraction Situations










Big Idea 3  More Complex Situations










2


Big Idea 1  Use Place Value


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Big Idea 2  Add 2Digit Numbers






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Big Idea 3  Money and Fluency for Addition Within 100


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3


Big Idea 1  Length and Shapes


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Big Idea 2  Estimate, Measure, and Make Line Plots


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4


Big Idea 1  Totals of Mixed Coins and Bills


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Big Idea 2  Multidigit Subtraction Strategies










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Big Idea 3  Word Problems: Addition and Subtraction Within 100






5


Big Idea 1  Time


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Big Idea 2  Picture Graphs


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Big Idea 3  Bar Graphs


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6


Big Idea 1  Understanding Numbers to 1,000


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Big Idea 2  Adding to 1,000


Big Idea 3  3Digit Subtraction






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Big Idea 4  3Digit Addition and Subtraction


7


Big Idea 1  Arrays and Equal Shares


Big Idea 2  Relate Addition and Subtraction to Length


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This document includes the IXL® skill alignments to Houghton Mifflin Harcourt's Math Expressions 2013 Common Core curriculum. IXL provides skill alignments as a service to teachers, students, and parents. The skill alignments are provided by IXL and are not affiliated with, sponsored by, reviewed, approved or endorsed by Houghton Mifflin Harcourt or any other third party. IXL® and IXL Learning® are registered trademarks of IXL Learning, Inc. All other intellectual property rights (e.g., unregistered and registered trademarks and copyrights) are the property of their respective owners.