Free Grade 3 Adding Integers Lessons
Free Grade 3 lessons for 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
Foundation
25 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify adding integers
Identify adding integers accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain adding integers
Explain adding integers accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate adding integers
Calculate adding integers accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare adding integers
Compare 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 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.-4 − 8 = ?[1]
- 2.-9 + (-8) = ?[1]
- 3.10 + 0 = ?[1]
- 4.-7 + 1 = ?[1]
- 5.20 + (-4) = ?[2]
- 6.-15 × 6 = ?[2]
- 7.-14 + 2 = ?[2]
- 8.-4 × 18 = ?[2]
- 9.21 + 0 = ?[3]
- 10.0 − 8 = ?[3]
- 11.-29 × (-18) = ?[3]
- 12.7 − (-30) = ?[3]
Show answers and working
1. -12
Subtracting 8 is the same as adding -8. -4 + (-8) = -12
2. -17
Start at -9 on a number line. Move 8 left. You land on -17.
3. 10
Start at 10 on a number line. Move 0 right. You land on 10.
4. -6
Start at -7 on a number line. Move 1 right. You land on -6.
5. 16
Start at 20 on a number line. Move 4 left. You land on 16.
6. -90
Multiply the sizes: 15 × 6 = 90. Same signs give positive, different signs give negative. Answer: -90
7. -12
Start at -14 on a number line. Move 2 right. You land on -12.
8. -72
Multiply the sizes: 4 × 18 = 72. Same signs give positive, different signs give negative. Answer: -72
9. 21
Start at 21 on a number line. Move 0 right. You land on 21.
10. -8
Subtracting 8 is the same as adding -8. 0 + (-8) = -8
11. 522
Multiply the sizes: 29 × 18 = 522. Same signs give positive, different signs give negative. Answer: 522
12. 37
Subtracting (-30) is the same as adding 30. 7 + 30 = 37
Worked examples
-3 − (-4) = ?
- Subtracting (-4) is the same as adding 4.
- -3 + 4 = 1
- Answer: 1
-20 − 0 = ?
- Subtracting 0 is the same as adding 0.
- -20 + 0 = -20
- Answer: -20
-15 × (-6) = ?
- Multiply the sizes: 15 × 6 = 90.
- Same signs give positive, different signs give negative.
- Answer: 90
- Answer: 90
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.
Every free resource for Adding Integers
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Frequently asked
- Is this Grade 3 Adding Integers 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 Integer Number Line, Negative Numbers, Number Formation. 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 Adding Integers?
- Move on to Subtracting Integers, Multiplying Integers, Absolute Value, Whole Numbers, which build directly on this idea.
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