Subtraction Facts to 20: Trashketball Review Questions
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Subtraction Facts to 20: Trashketball Review Questions
Trashketball and Around the World questions for subtraction facts within 20, Grade 1: 24 numbered questions to read aloud or project, such as 15 − 8. With an answer key, for any no-tech review game.
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Teach it first
Subtraction Facts to 20A teaching handout to hand out before this sheet: the rule, worked examples and common mistakes.- Pages
- 2
- Last updated
- Time
- About 20 minutes
- Answer key
- Included
- Printing
- Black and white
- Related curriculum
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Know the subtraction facts within 20, using the addition facts they belong to.
Reviewed by Mrs. Jennifer Mitchell, Teacher. How we check worksheets
How to use this sheet
- Have the child find each subtraction fact through addition: for 13 − 5, ask "5 and what make 13?"
- For facts past 10, show subtracting back to ten: 13 − 5 is 13 − 3 − 2, so 10 − 2.
- Mark the facts that took counting and do those again tomorrow, not the whole sheet.
Common mistakes
- Subtracting the smaller digit from the larger whatever the order, so 12 − 5 becomes 3 by doing 5 − 2. Use counters or a ten frame to show 12.
- Counting back and including the start number, so 9 − 3 becomes 7. Count the jumps back, not the start.
- Adding when they see two numbers. Read the sign aloud before each fact.
