Free Grade 3 Working with Adding Integers Lesson Plans
Free Grade 3 lesson plans for Working with Adding Integers: 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
15 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain working with adding integers
Explain working with adding integers accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with adding integers
Calculate working with adding integers accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with adding integers
Compare working with adding integers accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify working with adding integers
Justify working with adding integers 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 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 − 9 = ?[1]
- 2.7 − (-5) = ?[1]
- 3.-5 + 10 = ?[1]
- 4.-8 − (-10) = ?[1]
- 5.18 + (-15) = ?[2]
- 6.9 − (-20) = ?[2]
- 7.18 × 19 = ?[2]
- 8.-11 × (-8) = ?[2]
- 9.-23 + (-13) = ?[3]
- 10.22 × 10 = ?[3]
- 11.28 × (-14) = ?[3]
- 12.-3 × 15 = ?[3]
Show answers and working
1. -4
Subtracting 9 is the same as adding -9. 5 + (-9) = -4
2. 12
Subtracting (-5) is the same as adding 5. 7 + 5 = 12
3. 5
Start at -5 on a number line. Move 10 right. You land on 5.
4. 2
Subtracting (-10) is the same as adding 10. -8 + 10 = 2
5. 3
Start at 18 on a number line. Move 15 left. You land on 3.
6. 29
Subtracting (-20) is the same as adding 20. 9 + 20 = 29
7. 342
Multiply the sizes: 18 × 19 = 342. Same signs give positive, different signs give negative. Answer: 342
8. 88
Multiply the sizes: 11 × 8 = 88. Same signs give positive, different signs give negative. Answer: 88
9. -36
Start at -23 on a number line. Move 13 left. You land on -36.
10. 220
Multiply the sizes: 22 × 10 = 220. Same signs give positive, different signs give negative. Answer: 220
11. -392
Multiply the sizes: 28 × 14 = 392. Same signs give positive, different signs give negative. Answer: -392
12. -45
Multiply the sizes: 3 × 15 = 45. Same signs give positive, different signs give negative. Answer: -45
Worked examples
-3 − 7 = ?
- Subtracting 7 is the same as adding -7.
- -3 + (-7) = -10
- Answer: -10
4 × 12 = ?
- Multiply the sizes: 4 × 12 = 48.
- Same signs give positive, different signs give negative.
- Answer: 48
- Answer: 48
-7 + 23 = ?
- Start at -7 on a number line.
- Move 23 right.
- You land on 16.
- Answer: 16
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 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 Introducing Adding Integers, Integer Number Line. 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?
- Move on to Adding Integers in Context, Negative Numbers, Integer Number Line, Subtracting Integers, which build directly on this idea.
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