Free Grade 3 Introducing Rounding Decimals Lessons
Free Grade 3 lessons for Introducing Rounding Decimals: 12 real questions with a full answer key and worked solutions. Decimals extend place value past the ones: tenths, hundredths, thousandths. Line up decimal points when adding or subtracting.
Free
Foundation
15 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify introducing rounding decimals
Identify introducing rounding decimals accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain introducing rounding decimals
Explain introducing rounding decimals accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introducing rounding decimals
Calculate introducing rounding decimals accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introducing rounding decimals
Compare introducing rounding decimals 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 Introducing Rounding Decimals works
Decimals extend place value past the ones: tenths, hundredths, thousandths. Line up decimal points when adding or subtracting.
12 practice questions
Easy to hard, 24 marks in total. Try them first, then open the answers.
- 1.42.8 − 31.4 = ?[1]
- 2.80.2 − 8 = ?[1]
- 3.65.4 + 29.2 = ?[1]
- 4.88.7 − 24.2 = ?[1]
- 5.9.47 − 4.2 = ?[2]
- 6.5.5 + 3.53 = ?[2]
- 7.1.39 + 4.76 = ?[2]
- 8.8.4 − 1.8 = ?[2]
- 9.0.397 × 6 = ?[3]
- 10.0.566 × 9 = ?[3]
- 11.0.873 × 8 = ?[3]
- 12.0.101 × 5 = ?[3]
Show answers and working
1. 11.4
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Subtract as whole numbers: 11.4.
2. 72.2
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Subtract as whole numbers: 72.2.
3. 94.6
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Add as whole numbers: 94.6.
4. 64.5
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Subtract as whole numbers: 64.5.
5. 5.27
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Subtract as whole numbers: 5.27.
6. 9.03
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Add as whole numbers: 9.03.
7. 6.15
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Add as whole numbers: 6.15.
8. 6.6
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Subtract as whole numbers: 6.6.
9. 2.382
Ignore the decimal: 397 × 6 = 2382. Put back 3 decimal places: 2.382.
10. 5.094
Ignore the decimal: 566 × 9 = 5094. Put back 3 decimal places: 5.094.
11. 6.984
Ignore the decimal: 873 × 8 = 6984. Put back 3 decimal places: 6.984.
12. 0.505
Ignore the decimal: 101 × 5 = 505. Put back 3 decimal places: 0.505.
Worked examples
82.7 − 80.8 = ?
- Line up the decimal points.
- Fill gaps with zeros so both have 1 decimal place.
- Subtract as whole numbers: 1.9.
- Answer: 1.9
6.41 − 2.46 = ?
- Line up the decimal points.
- Fill gaps with zeros so both have 2 decimal places.
- Subtract as whole numbers: 3.95.
- Answer: 3.95
0.372 × 2 = ?
- Ignore the decimal: 372 × 2 = 744.
- Put back 3 decimal places: 0.744.
- Answer: 0.744
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 0.25 is bigger than 0.3 because 25 > 3.
Correction: Fill with zeros: 0.25 vs 0.30.
Lines up the last digits instead of the decimal points.
Correction: Decimal points go in one straight column.
Teacher tips
- · Use money to make tenths and hundredths concrete.
Parent tips
- · Add up prices with cents together.
Real-life applications
- · Money, measurements, race times.
Assessment objectives
How mastery is evidenced, and which standards it maps to.
Every free resource for Introducing Rounding Decimals
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Frequently asked
- Is this Grade 3 Introducing Rounding Decimals 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 Comparing Decimals. 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 Introducing Rounding Decimals?
- Move on to Working with Rounding Decimals, Rounding Decimals in Context, Decimal Place Value, Reading Decimals, which build directly on this idea.
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