Free Grade 3 Working with Introducing Adding Integers Common Errors: Visual Models Lesson Plans
Free Grade 3 lesson plans for Working with Introducing Adding Integers Common Errors: Visual Models: 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
30 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: visual models
Identify working with introducing adding integers common errors: visual models accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain working with introducing adding integers common errors: visual models
Explain working with introducing adding integers common errors: visual models accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with introducing adding integers common errors: visual models
Calculate working with introducing adding integers common errors: visual models accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with introducing adding integers common errors: visual models
Compare working with introducing adding integers common errors: visual models 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: Visual Models 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.
- 1.10 − (-9) = ?[1]
- 2.9 − 7 = ?[1]
- 3.1 + (-8) = ?[1]
- 4.-6 + 6 = ?[1]
- 5.19 − 19 = ?[2]
- 6.1 × (-2) = ?[2]
- 7.-20 + 0 = ?[2]
- 8.9 + 11 = ?[2]
- 9.7 − 25 = ?[3]
- 10.-15 × (-30) = ?[3]
- 11.5 + 27 = ?[3]
- 12.-3 × (-29) = ?[3]
Show answers and working
1. 19
Subtracting (-9) is the same as adding 9. 10 + 9 = 19
2. 2
Subtracting 7 is the same as adding -7. 9 + (-7) = 2
3. -7
Start at 1 on a number line. Move 8 left. You land on -7.
4. 0
Start at -6 on a number line. Move 6 right. You land on 0.
5. 0
Subtracting 19 is the same as adding -19. 19 + (-19) = 0
6. -2
Multiply the sizes: 1 × 2 = 2. Same signs give positive, different signs give negative. Answer: -2
7. -20
Start at -20 on a number line. Move 0 right. You land on -20.
8. 20
Start at 9 on a number line. Move 11 right. You land on 20.
9. -18
Subtracting 25 is the same as adding -25. 7 + (-25) = -18
10. 450
Multiply the sizes: 15 × 30 = 450. Same signs give positive, different signs give negative. Answer: 450
11. 32
Start at 5 on a number line. Move 27 right. You land on 32.
12. 87
Multiply the sizes: 3 × 29 = 87. Same signs give positive, different signs give negative. Answer: 87
Worked examples
-1 − (-8) = ?
- Subtracting (-8) is the same as adding 8.
- -1 + 8 = 7
- Answer: 7
7 + 13 = ?
- Start at 7 on a number line.
- Move 13 right.
- You land on 20.
- Answer: 20
20 − (-14) = ?
- Subtracting (-14) is the same as adding 14.
- 20 + 14 = 34
- Answer: 34
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
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