Free Grade 3 Introducing Adding Decimals Common Errors Quizzes
Free Grade 3 quizzes for Introducing Adding Decimals Common Errors: 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
Stretch
25 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify introducing adding decimals common errors
Identify introducing adding decimals common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain introducing adding decimals common errors
Explain introducing adding decimals common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introducing adding decimals common errors
Calculate introducing adding decimals common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introducing adding decimals common errors
Compare introducing adding decimals common errors 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 Adding Decimals Common Errors 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.
- 1.58.1 − 30 = ?[1]
- 2.92.7 + 40.6 = ?[1]
- 3.39.8 − 15.2 = ?[1]
- 4.42 − 31 = ?[1]
- 5.7.44 + 2.67 = ?[2]
- 6.6.03 + 9.26 = ?[2]
- 7.9.13 − 5.88 = ?[2]
- 8.4.76 − 0.75 = ?[2]
- 9.0.335 × 2 = ?[3]
- 10.0.048 × 8 = ?[3]
- 11.0.839 × 5 = ?[3]
- 12.0.568 × 7 = ?[3]
Show answers and working
1. 28.1
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Subtract as whole numbers: 28.1.
2. 133.3
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Add as whole numbers: 133.3.
3. 24.6
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Subtract as whole numbers: 24.6.
4. 11
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Subtract as whole numbers: 11.
5. 10.11
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Add as whole numbers: 10.11.
6. 15.29
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Add as whole numbers: 15.29.
7. 3.25
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Subtract as whole numbers: 3.25.
8. 4.01
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Subtract as whole numbers: 4.01.
9. 0.67
Ignore the decimal: 335 × 2 = 670. Put back 3 decimal places: 0.67.
10. 0.384
Ignore the decimal: 48 × 8 = 384. Put back 3 decimal places: 0.384.
11. 4.195
Ignore the decimal: 839 × 5 = 4195. Put back 3 decimal places: 4.195.
12. 3.976
Ignore the decimal: 568 × 7 = 3976. Put back 3 decimal places: 3.976.
Worked examples
90.5 − 85.2 = ?
- Line up the decimal points.
- Fill gaps with zeros so both have 1 decimal place.
- Subtract as whole numbers: 5.3.
- Answer: 5.3
9.68 − 3.94 = ?
- Line up the decimal points.
- Fill gaps with zeros so both have 2 decimal places.
- Subtract as whole numbers: 5.74.
- Answer: 5.74
0.048 × 7 = ?
- Ignore the decimal: 48 × 7 = 336.
- Put back 3 decimal places: 0.336.
- Answer: 0.336
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.
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Frequently asked
- Is this Grade 3 Introducing Adding Decimals Common Errors quiz really free?
- Yes. Every quizzes 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 Decimals Word Problems, Introducing Adding Decimals Techniques, Rounding Decimals. Each one has its own free lesson, worksheet and quiz.
- How is the quiz 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 Adding Decimals Common Errors?
- Move on to Working with Adding Decimals, Adding Decimals in Context, which build directly on this idea.
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