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

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

http://www.commoncoresheets.com/SortedByGrade.php?Sorted=1oa2
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.

## 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 ResourcesDaisies 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.

NRich Maths Maths Story Problems

Students act out story problems with manipulatives

nrich.maths.org

Cambridge University

Task from www.achievethecore.org that...Builds toward understanding of the place value system (1.NBT.B)Engages students in several Standards for Mathematical PracticePresents an application in an engaging settingEncourages students to talk about each other's thinkingImproves students' mathematical understandingAllows for group or individual workhttp://www.commoncoresheets.com/SortedByGrade.php?Sorted=1oa2

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),doubleandnear double, or abridge tostrategy.Student Friendly Technology