Free Grade 3 Working with Introducing Adding Decimals Common Errors: Step-by-step Method Flashcards
Free Grade 3 flashcards for Working with Introducing Adding Decimals Common Errors: Step-by-step Method: 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
25 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify working with introducing adding decimals common errors: step-by-step method
Identify working with introducing adding decimals common errors: step-by-step method accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain working with introducing adding decimals common errors: step-by-step method
Explain working with introducing adding decimals common errors: step-by-step method accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with introducing adding decimals common errors: step-by-step method
Calculate working with introducing adding decimals common errors: step-by-step method accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with introducing adding decimals common errors: step-by-step method
Compare working with introducing adding decimals common errors: step-by-step method 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: Step-by-step Method 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.
- 1.94.9 − 54.6 = ?[1]
- 2.89.2 − 72.8 = ?[1]
- 3.36 + 70.2 = ?[1]
- 4.71.8 − 31.2 = ?[1]
- 5.0.25 + 7.71 = ?[2]
- 6.2.6 − 1.75 = ?[2]
- 7.4.96 + 6.74 = ?[2]
- 8.8.47 − 3.72 = ?[2]
- 9.0.145 × 2 = ?[3]
- 10.0.702 × 6 = ?[3]
- 11.0.254 × 2 = ?[3]
- 12.0.045 × 6 = ?[3]
Show answers and working
1. 40.3
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Subtract as whole numbers: 40.3.
2. 16.4
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Subtract as whole numbers: 16.4.
3. 106.2
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Add as whole numbers: 106.2.
4. 40.6
Line up the decimal points. Fill gaps with zeros so both have 1 decimal place. Subtract as whole numbers: 40.6.
5. 7.96
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Add as whole numbers: 7.96.
6. 0.85
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Subtract as whole numbers: 0.85.
7. 11.7
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Add as whole numbers: 11.7.
8. 4.75
Line up the decimal points. Fill gaps with zeros so both have 2 decimal places. Subtract as whole numbers: 4.75.
9. 0.29
Ignore the decimal: 145 × 2 = 290. Put back 3 decimal places: 0.29.
10. 4.212
Ignore the decimal: 702 × 6 = 4212. Put back 3 decimal places: 4.212.
11. 0.508
Ignore the decimal: 254 × 2 = 508. Put back 3 decimal places: 0.508.
12. 0.27
Ignore the decimal: 45 × 6 = 270. Put back 3 decimal places: 0.27.
Worked examples
48.8 + 88.7 = ?
- Line up the decimal points.
- Fill gaps with zeros so both have 1 decimal place.
- Add as whole numbers: 137.5.
- Answer: 137.5
1.39 + 3.23 = ?
- Line up the decimal points.
- Fill gaps with zeros so both have 2 decimal places.
- Add as whole numbers: 4.62.
- Answer: 4.62
0.085 × 9 = ?
- Ignore the decimal: 85 × 9 = 765.
- Put back 3 decimal places: 0.765.
- Answer: 0.765
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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