Grade 1/Addition
Mixed Word Problems: Addition and Subtraction to 20 (233)
Mixed one-step addition and subtraction word problems with numbers under 20 to build reading-comprehension and calculation fluency.
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Quick Tip
Encourage using mental strategies like number bonds and counting on/back. Draw pictures if needed.
Teacher Resources
Teaching Notes
Emphasize identifying keywords (e.g., 'altogether', 'left') to determine the correct operation. Encourage visual aids like drawings or number lines for problem-solving.
Vocabulary
Mixed problems: Problems using different math operations.
Operation: A math process like add or subtract.
Common Mistakes
- Misinterpreting the operation (addition vs. subtraction)
- Not fully reading or understanding the word problem
- Minor calculation errors within 20
Differentiation
SupportProvide manipulatives, read problems aloud, and highlight key action words. Start with simpler numbers.
ChallengeChallenge students to create their own word problems or introduce similar two-step problems orally.
Discussion Questions
- How did you decide whether to add or subtract?
- What clues in the story helped you?
- Can you draw a picture to show how you solved it?
Extension Activities
- Draw pictures for problems.
- Use a number line.
- Create your own mixed problems.
Parent Tip
Ask your child to sort word problems by operation.
Learning Path
Skill Cluster
Operations & Algebraic Thinking
Estimated Time
15 minutes
Skills Practiced
addition subtraction word problemsmixed operationsdecision making
Prerequisites
- Addition facts within 20
- Subtraction facts within 20
- Reading simple sentences
Next Steps
- Two-step addition and subtraction word problems
- Mixed addition and subtraction within 100
- Problem solving with measurement or money
- Two-Step Word Problems to 20
- Mixed Operations: Add & Subtract to 100
- Solving Word Problems with Bar Models