Free Grade 3 Adding Decimals Quizzes
Free Grade 3 quizzes for Adding 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
Core
35 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify adding decimals
Identify adding decimals accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain adding decimals
Explain adding decimals accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate adding decimals
Calculate adding decimals accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare adding decimals
Compare adding 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 Adding 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.
- 1.40.7 + 5.7 = ?[1]
- 2.30.6 + 58.4 = ?[1]
- 3.64.3 − 36.7 = ?[1]
- 4.62 − 28.6 = ?[1]
- 5.7.81 − 3.83 = ?[2]
- 6.8.79 + 5.5 = ?[2]
- 7.2.28 + 9.46 = ?[2]
- 8.7.59 + 1.73 = ?[2]
- 9.0.366 × 7 = ?[3]
- 10.0.526 × 9 = ?[3]
- 11.0.813 × 5 = ?[3]
- 12.0.784 × 6 = ?[3]
Show answers and working
1. 46.4
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Add as whole numbers: 46.4.
2. 89
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Add as whole numbers: 89.
3. 27.6
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Subtract as whole numbers: 27.6.
4. 33.4
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Subtract as whole numbers: 33.4.
5. 3.98
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Subtract as whole numbers: 3.98.
6. 14.29
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Add as whole numbers: 14.29.
7. 11.74
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Add as whole numbers: 11.74.
8. 9.32
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Add as whole numbers: 9.32.
9. 2.562
Ignore the decimal: 366 × 7 = 2562. Put back 3 decimal places: 2.562.
10. 4.734
Ignore the decimal: 526 × 9 = 4734. Put back 3 decimal places: 4.734.
11. 4.065
Ignore the decimal: 813 × 5 = 4065. Put back 3 decimal places: 4.065.
12. 4.704
Ignore the decimal: 784 × 6 = 4704. Put back 3 decimal places: 4.704.
Worked examples
97.9 + 46.1 = ?
- Line up the decimal points.
- Fill gaps with zeros so both have 1 decimal place.
- Add as whole numbers: 144.
- Answer: 144
8.54 + 2.82 = ?
- Line up the decimal points.
- Fill gaps with zeros so both have 2 decimal places.
- Add as whole numbers: 11.36.
- Answer: 11.36
0.025 × 6 = ?
- Ignore the decimal: 25 × 6 = 150.
- Put back 3 decimal places: 0.15.
- Answer: 0.15
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 Adding Decimals
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Frequently asked
- Is this Grade 3 Adding Decimals 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 Rounding Decimals, Comparing Decimals, Fractions. 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 Adding Decimals?
- Move on to Multiplying Decimals, Dividing Decimals, Recurring Decimals, Whole Numbers, which build directly on this idea.
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