Free Grade 3 Working with Adding Integers Common Errors Lesson Plans
Free Grade 3 lesson plans for Working with 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
Foundation
15 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify working with adding integers common errors
Identify working with adding integers common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain working with adding integers common errors
Explain working with adding integers common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with adding integers common errors
Calculate working with adding integers common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with adding integers common errors
Compare working with 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 Working with 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.
- 1.1 − (-1) = ?[1]
- 2.6 − (-4) = ?[1]
- 3.2 − 1 = ?[1]
- 4.-3 + (-7) = ?[1]
- 5.2 + (-13) = ?[2]
- 6.-8 + (-11) = ?[2]
- 7.-16 − 5 = ?[2]
- 8.6 × 1 = ?[2]
- 9.-19 × (-20) = ?[3]
- 10.-28 + 29 = ?[3]
- 11.3 × 19 = ?[3]
- 12.-24 − (-22) = ?[3]
Show answers and working
1. 2
Subtracting (-1) is the same as adding 1. 1 + 1 = 2
2. 10
Subtracting (-4) is the same as adding 4. 6 + 4 = 10
3. 1
Subtracting 1 is the same as adding -1. 2 + (-1) = 1
4. -10
Start at -3 on a number line. Move 7 left. You land on -10.
5. -11
Start at 2 on a number line. Move 13 left. You land on -11.
6. -19
Start at -8 on a number line. Move 11 left. You land on -19.
7. -21
Subtracting 5 is the same as adding -5. -16 + (-5) = -21
8. 6
Multiply the sizes: 6 × 1 = 6. Same signs give positive, different signs give negative. Answer: 6
9. 380
Multiply the sizes: 19 × 20 = 380. Same signs give positive, different signs give negative. Answer: 380
10. 1
Start at -28 on a number line. Move 29 right. You land on 1.
11. 57
Multiply the sizes: 3 × 19 = 57. Same signs give positive, different signs give negative. Answer: 57
12. -2
Subtracting (-22) is the same as adding 22. -24 + 22 = -2
Worked examples
7 − (-1) = ?
- Subtracting (-1) is the same as adding 1.
- 7 + 1 = 8
- Answer: 8
-15 × (-20) = ?
- Multiply the sizes: 15 × 20 = 300.
- Same signs give positive, different signs give negative.
- Answer: 300
- Answer: 300
-9 × (-15) = ?
- Multiply the sizes: 9 × 15 = 135.
- Same signs give positive, different signs give negative.
- Answer: 135
- Answer: 135
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 Adding Integers Common Errors lesson plan really free?
- Yes. Every lesson plans 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 Adding Integers Word Problems, Working with Adding Integers Techniques, Introducing Adding Integers. Each one has its own free lesson, worksheet and quiz.
- How is the lesson plan 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 Adding Integers Common Errors?
- Move on to Introducing Adding Integers, Adding Integers in Context, which build directly on this idea.
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