Free Grade 3 Working with Negative Numbers Common Errors Lessons
Free Grade 3 lessons for Working with Negative Numbers Common Errors: 12 real questions with a full answer key and worked solutions. Integers include negative numbers. On a number line, adding moves right and subtracting moves left. Subtracting a negative is the same as adding.
Free
Stretch
35 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain working with negative numbers common errors
Explain working with negative numbers common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with negative numbers common errors
Calculate working with negative numbers common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with negative numbers common errors
Compare working with negative numbers common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify working with negative numbers common errors
Justify working with negative numbers common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
Prerequisites
Close these gaps first — each has its own free lesson, worksheet and quiz.
How Working with Negative Numbers Common Errors works
Integers include negative numbers. On a number line, adding moves right and subtracting moves left. Subtracting a negative is the same as adding.
12 practice questions
Easy to hard, 24 marks in total. Try them first, then open the answers.
- 1.-5 + 0 = ?[1]
- 2.2 + (-3) = ?[1]
- 3.-6 − 0 = ?[1]
- 4.-10 + (-3) = ?[1]
- 5.-19 − (-18) = ?[2]
- 6.0 × 6 = ?[2]
- 7.-20 × 2 = ?[2]
- 8.-20 + (-9) = ?[2]
- 9.-6 + (-26) = ?[3]
- 10.12 × (-14) = ?[3]
- 11.-28 − 26 = ?[3]
- 12.-18 − 24 = ?[3]
Show answers and working
1. -5
Start at -5 on a number line. Move 0 right. You land on -5.
2. -1
Start at 2 on a number line. Move 3 left. You land on -1.
3. -6
Subtracting 0 is the same as adding 0. -6 + 0 = -6
4. -13
Start at -10 on a number line. Move 3 left. You land on -13.
5. -1
Subtracting (-18) is the same as adding 18. -19 + 18 = -1
6. 0
Multiply the sizes: 0 × 6 = 0. Same signs give positive, different signs give negative. Answer: 0
7. -40
Multiply the sizes: 20 × 2 = 40. Same signs give positive, different signs give negative. Answer: -40
8. -29
Start at -20 on a number line. Move 9 left. You land on -29.
9. -32
Start at -6 on a number line. Move 26 left. You land on -32.
10. -168
Multiply the sizes: 12 × 14 = 168. Same signs give positive, different signs give negative. Answer: -168
11. -54
Subtracting 26 is the same as adding -26. -28 + (-26) = -54
12. -42
Subtracting 24 is the same as adding -24. -18 + (-24) = -42
Worked examples
-7 + 0 = ?
- Start at -7 on a number line.
- Move 0 right.
- You land on -7.
- Answer: -7
-8 − 20 = ?
- Subtracting 20 is the same as adding -20.
- -8 + (-20) = -28
- Answer: -28
5 − (-8) = ?
- Subtracting (-8) is the same as adding 8.
- 5 + 8 = 13
- Answer: 13
Interactive practice
Free, no account required — answer on screen or print it.
Common mistakes
What learners typically get wrong, and how to fix it.
Thinks −8 is bigger than −3.
Correction: Further left on the number line means smaller.
Treats − (−4) as −4.
Correction: Two minus signs together become a plus.
Teacher tips
- · Use a vertical number line like a thermometer.
Parent tips
- · Compare winter temperatures from the weather forecast.
Real-life applications
- · Temperatures below zero, bank balances, floors below ground.
Assessment objectives
How mastery is evidenced, and which standards it maps to.
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Frequently asked
- Is this Grade 3 Working with Negative Numbers Common Errors lesson really free?
- Yes. Every lessons on FreeMathWorksheet is free to use, print and share — no account, no paywall and no watermark.
- What should a learner already know before this?
- Start with Working with Negative Numbers Word Problems, Working with Negative Numbers Techniques, Introducing Negative Numbers. Each one has its own free lesson, worksheet and quiz.
- How is the lesson sequenced?
- Recognition first, then understanding, application, reasoning and finally mastery — the same ladder used across every free resource on the platform.
- What comes next after Working with Negative Numbers Common Errors?
- Move on to Introducing Negative Numbers, Negative Numbers in Context, which build directly on this idea.
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