Free Grade 3 Introducing Adding Integers Common Errors Lessons
Free Grade 3 lessons for Introducing Adding Integers 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
Higher
20 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify introducing adding integers common errors
Identify introducing adding integers common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain introducing adding integers common errors
Explain introducing adding integers common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introducing adding integers common errors
Calculate introducing adding integers common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introducing adding integers common errors
Compare introducing adding integers 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 Introducing Adding Integers 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.
- 1.4 − (-1) = ?[1]
- 2.3 − (-8) = ?[1]
- 3.-4 − (-10) = ?[1]
- 4.-9 + 1 = ?[1]
- 5.-15 × 5 = ?[2]
- 6.20 × (-20) = ?[2]
- 7.19 × 3 = ?[2]
- 8.-14 + (-6) = ?[2]
- 9.6 × 17 = ?[3]
- 10.-19 + 22 = ?[3]
- 11.-7 − (-26) = ?[3]
- 12.20 × (-21) = ?[3]
Show answers and working
1. 5
Subtracting (-1) is the same as adding 1. 4 + 1 = 5
2. 11
Subtracting (-8) is the same as adding 8. 3 + 8 = 11
3. 6
Subtracting (-10) is the same as adding 10. -4 + 10 = 6
4. -8
Start at -9 on a number line. Move 1 right. You land on -8.
5. -75
Multiply the sizes: 15 × 5 = 75. Same signs give positive, different signs give negative. Answer: -75
6. -400
Multiply the sizes: 20 × 20 = 400. Same signs give positive, different signs give negative. Answer: -400
7. 57
Multiply the sizes: 19 × 3 = 57. Same signs give positive, different signs give negative. Answer: 57
8. -20
Start at -14 on a number line. Move 6 left. You land on -20.
9. 102
Multiply the sizes: 6 × 17 = 102. Same signs give positive, different signs give negative. Answer: 102
10. 3
Start at -19 on a number line. Move 22 right. You land on 3.
11. 19
Subtracting (-26) is the same as adding 26. -7 + 26 = 19
12. -420
Multiply the sizes: 20 × 21 = 420. Same signs give positive, different signs give negative. Answer: -420
Worked examples
0 − (-1) = ?
- Subtracting (-1) is the same as adding 1.
- 0 + 1 = 1
- Answer: 1
0 + 9 = ?
- Start at 0 on a number line.
- Move 9 right.
- You land on 9.
- Answer: 9
26 + (-25) = ?
- Start at 26 on a number line.
- Move 25 left.
- You land on 1.
- Answer: 1
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 Introducing Adding Integers 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 Introducing Adding Integers Word Problems, Introducing Adding Integers Techniques, Integer Number Line. 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 Introducing Adding Integers Common Errors?
- Move on to Working with Adding Integers, Adding Integers in Context, which build directly on this idea.
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