Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.

Lesson Planning and Activity Resources

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1.OA--Interactive games for Operations and Algebraic Thinking

Lesson from Illustrative Mathematics.

Daisies in Vases
Students work with this task that
illustrates the intent of 1.OA.2
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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NRich Maths Maths Story Problems
Students act out story problems with manipulatives
Cambridge University

Task from that...
  • Builds toward understanding of the place value system (1.NBT.B)
  • Engages students in several Standards for Mathematical Practice
  • Presents an application in an engaging setting
  • Encourages students to talk about each other's thinking
  • Improves students' mathematical understanding
  • Allows for group or individual work
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Each worksheet contains 15 problems adding 3 digits. Sum is less than 20. Students need to be using appropriate strategies. Such as a count on (when one addend is less than 3), double and near double, or a bridge to strategy.

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