Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.1


Lesson Planning and Activity Resources

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1.OA.A.1 and 1.NBT.C.4 from NZMaths

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1.OA--Interactive games for Operations and Algebraic Thinking
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Grade 1 Unit: Operations & Algebraic Thinking
(from Georgia Department of Education)
This unit addresses KCAS 1.OA.1-8 and 1.MD.4.
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1.OA.1 Lesson: Compare - Difference Unknown
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1.OA.1 Lesson: The Crayon Box
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Formative Assessment Lesson--Caterpillars and Leaves:
Represent and solve problems involving addition

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1.OA.1 Lesson: A Day at the Beach
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1.OA.1 Lesson: Toy Cars
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http://www.commoncoresheets.
com/SortedByGrade.php?Sorted=1oa1
  • Each worksheets contains 12 problems finding the result of an addition problem.
  • Each worksheet has problems finding the value of a variable.
(These questions should be used with a storyboard)

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http://s3.amazonaws.com/illustrativemathematics/
illustration_pdfs/000/000/160/original/illustrative
_mathematics_160.pdf?1390748287
This task includes three different problem types using the "Add To" context with a discrete quantity