Grade 8 find the mistake
This Grade 8 worksheet practices grade 8 find the mistake (Common Core 8.EE.B.6, 8.NS.A.1; Alberta Number 3).
8 Grade 8 problems with a student's answer to check. Some are right and some are wrong. With an answer key.
8 problems · answer key on the last page · each version has different numbers · Print from the browser
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On this sheet
- Ben says 4¹² ÷ 4⁸ = 4²⁰. Is Ben right? — answer: No, it is 4⁴
- Dev says 2.9 × 10⁵ written in standard form is 29,000. Is Dev right? — answer: No, it is 290,000
- A toy car goes 5 inches per second. 1 foot is 12 inches and 1 minute is 60 seconds. Ivy says that is 300 feet per minute, because 5 × 60 = 300. What is that rate, in feet per minute? — answer: 25
How to teach it
- Work the problem yourself first.
- Compare with the student's answer. If they differ, find the step where it went wrong.
- Say what the mistake was and what the right answer is.
Questions teachers ask
- How many problems are on this worksheet?
- 8 on one page, with the answer key on the last page.
- What grade and standard is it for?
- Grade 8. Common Core: 8.EE.B.6, 8.NS.A.1. Alberta: Number 3.
- Can I print more than one version?
- Yes. Every version has different numbers and its own answer key. Use “Make another version” for a new one; the same version always prints the same.
- Why are some of the answers right?
- If every answer were wrong, students would only look for an error. Mixing right and wrong answers makes them check each one, which is the skill that matters.
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