## 1.OA.1

1.OA.1 – 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}

**Internet Resources (Videos, Websites, etc.)**

Houghton Mifflin Harcourt

- Busy Bees

Illustrative Mathematics Project

- Illustrations

K-5 Math Teaching Resources

- Addition Word Problems
- Subtraction Word Problems
- Bunk Bed Problem
- Double Decker Bus Problem
- Making Apple Ten Packs
- Domino Addition

Khan Academy

- Basic Addition (Video)

Math Playground

- 2-Step Add and Subtract Word Problems – 1
- 2-Step Add and Subtract Word Problems – 2
- 2-Step Add and Subtract Word Problems – 3
- 1-Step Add and Subtract Word Problems – 1
- 1-Step Add and Subtract Word Problems – 2
- 1-Step Add and Subtract Word Problems – 3

NCTM Illuminations

- How Many Left?
- Take Away

Online Practice from IXL

- Addition: Addition with pictures – sums to 10
- Addition: Addition sentences – sums to 10
- Addition: Addition word problems – sums to 10
- Addition: Word problems – write the addition sentence
- Addition: Addition word problems – sums to 18
- Addition: Complete the addition sentence
- Subtraction: Subtraction with pictures – numbers up to 10
- Subtraction: Subtraction sentences – numbers up to 10
- Subtraction: Subtraction word problems – one-digit numbers
- Subtraction: Word problems – write the subtraction sentence
- Subtraction: Subtraction word problems – numbers up to 18
- Subtraction: Complete the subtraction sentence
- Mixed operations: Addition and subtraction word problems
- Comparing: Comparison word problems
- Measurement: Customary units of length: word problems
- Measurement: Metric units of length: word problems

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