Free Grade 3 Working with Introducing Adding Integers Common Errors: Step-by-step Method Lesson Plans
Free Grade 3 lesson plans for Working with Introducing Adding Integers Common Errors: Step-by-step Method: 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 working with introducing adding integers common errors: step-by-step method
Identify working with introducing adding integers common errors: step-by-step method accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain working with introducing adding integers common errors: step-by-step method
Explain working with introducing adding integers common errors: step-by-step method accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with introducing adding integers common errors: step-by-step method
Calculate working with introducing adding integers common errors: step-by-step method accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with introducing adding integers common errors: step-by-step method
Compare working with introducing adding integers common errors: step-by-step method 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 Introducing Adding Integers Common Errors: Step-by-step Method 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.
- 1.8 − (-5) = ?[1]
- 2.-7 − (-7) = ?[1]
- 3.4 − 5 = ?[1]
- 4.-4 − (-5) = ?[1]
- 5.-8 + (-19) = ?[2]
- 6.-18 × (-11) = ?[2]
- 7.-11 − (-18) = ?[2]
- 8.5 − (-15) = ?[2]
- 9.22 + 22 = ?[3]
- 10.-30 − 19 = ?[3]
- 11.-17 + 30 = ?[3]
- 12.-20 + 2 = ?[3]
Show answers and working
1. 13
Subtracting (-5) is the same as adding 5. 8 + 5 = 13
2. 0
Subtracting (-7) is the same as adding 7. -7 + 7 = 0
3. -1
Subtracting 5 is the same as adding -5. 4 + (-5) = -1
4. 1
Subtracting (-5) is the same as adding 5. -4 + 5 = 1
5. -27
Start at -8 on a number line. Move 19 left. You land on -27.
6. 198
Multiply the sizes: 18 × 11 = 198. Same signs give positive, different signs give negative. Answer: 198
7. 7
Subtracting (-18) is the same as adding 18. -11 + 18 = 7
8. 20
Subtracting (-15) is the same as adding 15. 5 + 15 = 20
9. 44
Start at 22 on a number line. Move 22 right. You land on 44.
10. -49
Subtracting 19 is the same as adding -19. -30 + (-19) = -49
11. 13
Start at -17 on a number line. Move 30 right. You land on 13.
12. -18
Start at -20 on a number line. Move 2 right. You land on -18.
Worked examples
7 − (-8) = ?
- Subtracting (-8) is the same as adding 8.
- 7 + 8 = 15
- Answer: 15
6 − 16 = ?
- Subtracting 16 is the same as adding -16.
- 6 + (-16) = -10
- Answer: -10
5 × (-3) = ?
- Multiply the sizes: 5 × 3 = 15.
- Same signs give positive, different signs give negative.
- Answer: -15
- Answer: -15
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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