Free Grade 3 Working with Introducing Adding Decimals Common Errors Flashcards
Free Grade 3 flashcards for Working with 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
Higher
15 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain working with introducing adding decimals common errors
Explain working with introducing adding decimals common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with introducing adding decimals common errors
Calculate working with introducing adding decimals common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with introducing adding decimals common errors
Compare working with introducing adding decimals common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify working with introducing adding decimals common errors
Justify working with 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 Working with 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.
- 1.15.7 + 32.7 = ?[1]
- 2.65.8 + 32.1 = ?[1]
- 3.90.9 + 1.9 = ?[1]
- 4.18 + 2.9 = ?[1]
- 5.9.39 − 9.18 = ?[2]
- 6.6.45 + 0.92 = ?[2]
- 7.9.46 − 8.16 = ?[2]
- 8.1.24 − 1.13 = ?[2]
- 9.0.767 × 6 = ?[3]
- 10.0.485 × 3 = ?[3]
- 11.0.947 × 3 = ?[3]
- 12.0.15 × 8 = ?[3]
Show answers and working
1. 48.4
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Add as whole numbers: 48.4.
2. 97.9
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Add as whole numbers: 97.9.
3. 92.8
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Add as whole numbers: 92.8.
4. 20.9
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Add as whole numbers: 20.9.
5. 0.21
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Subtract as whole numbers: 0.21.
6. 7.37
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Add as whole numbers: 7.37.
7. 1.3
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Subtract as whole numbers: 1.3.
8. 0.11
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Subtract as whole numbers: 0.11.
9. 4.602
Ignore the decimal: 767 × 6 = 4602. Put back 3 decimal places: 4.602.
10. 1.455
Ignore the decimal: 485 × 3 = 1455. Put back 3 decimal places: 1.455.
11. 2.841
Ignore the decimal: 947 × 3 = 2841. Put back 3 decimal places: 2.841.
12. 1.2
Ignore the decimal: 150 × 8 = 1200. Put back 3 decimal places: 1.2.
Worked examples
51.1 − 46.6 = ?
- Line up the decimal points.
- Fill gaps with zeros so both have 1 decimal place.
- Subtract as whole numbers: 4.5.
- Answer: 4.5
6.96 − 5.99 = ?
- Line up the decimal points.
- Fill gaps with zeros so both have 2 decimal places.
- Subtract as whole numbers: 0.97.
- Answer: 0.97
0.244 × 5 = ?
- Ignore the decimal: 244 × 5 = 1220.
- Put back 3 decimal places: 1.22.
- Answer: 1.22
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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- Start with Rules and Methods in Introducing Adding Decimals Common Errors, Key Vocabulary of Introducing Adding Decimals Common Errors, Introducing Adding Decimals Word Problems. Each one has its own free lesson, worksheet and quiz.
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- Move on to Introducing Adding Decimals Common Errors in Examinations, Introducing Adding Decimals Essentials, Introducing Adding Decimals Techniques, Introducing Adding Decimals Word Problems, which build directly on this idea.
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