Free Grade 3 Working with Estimation in Context Common Errors: Common Mistakes Lessons
Free Grade 3 lessons for Working with Estimation in Context Common Errors: Common Mistakes: 12 real questions with a full answer key and worked solutions. Rounding gives a simpler number that is close to the real one. Look at the digit just right of the place you round to: 5 or more rounds up, 4 or less rounds down.
Free
Stretch
30 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain working with estimation in context common errors: common mistakes
Explain working with estimation in context common errors: common mistakes accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with estimation in context common errors: common mistakes
Calculate working with estimation in context common errors: common mistakes accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with estimation in context common errors: common mistakes
Compare working with estimation in context common errors: common mistakes accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify working with estimation in context common errors: common mistakes
Justify working with estimation in context common errors: common mistakes 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 Estimation in Context Common Errors: Common Mistakes works
Rounding gives a simpler number that is close to the real one. Look at the digit just right of the place you round to: 5 or more rounds up, 4 or less rounds down.
12 practice questions
Easy to hard, 24 marks in total. Try them first, then open the answers.
- 1.Round 513 to the nearest 10.[1]
- 2.Round 572 to the nearest 10.[1]
- 3.Round 580 to the nearest 10.[1]
- 4.Round 599 to the nearest 10.[1]
- 5.Round 3,741 to the nearest 100.[2]
- 6.Round 2,266 to the nearest 10.[2]
- 7.Round 6,957 to the nearest 10.[2]
- 8.Round 9,119 to the nearest 100.[2]
- 9.Round 99,075 to the nearest 100.[3]
- 10.Round 50,477 to the nearest 100.[3]
- 11.Round 2,890 to the nearest 100.[3]
- 12.Round 6,114 to the nearest 100.[3]
Show answers and working
1. 510
Find the two multiples of 10 either side: 510 and 520. Look at the digit to the right of the rounding place: 5 or more rounds up. 513 rounds to 510.
2. 570
Find the two multiples of 10 either side: 570 and 580. Look at the digit to the right of the rounding place: 5 or more rounds up. 572 rounds to 570.
3. 580
Find the two multiples of 10 either side: 580 and 580. Look at the digit to the right of the rounding place: 5 or more rounds up. 580 rounds to 580.
4. 600
Find the two multiples of 10 either side: 590 and 600. Look at the digit to the right of the rounding place: 5 or more rounds up. 599 rounds to 600.
5. 3,700
Find the two multiples of 100 either side: 3700 and 3800. Look at the digit to the right of the rounding place: 5 or more rounds up. 3741 rounds to 3700.
6. 2,270
Find the two multiples of 10 either side: 2260 and 2270. Look at the digit to the right of the rounding place: 5 or more rounds up. 2266 rounds to 2270.
7. 6,960
Find the two multiples of 10 either side: 6950 and 6960. Look at the digit to the right of the rounding place: 5 or more rounds up. 6957 rounds to 6960.
8. 9,100
Find the two multiples of 100 either side: 9100 and 9200. Look at the digit to the right of the rounding place: 5 or more rounds up. 9119 rounds to 9100.
9. 99,100
Find the two multiples of 100 either side: 99000 and 99100. Look at the digit to the right of the rounding place: 5 or more rounds up. 99075 rounds to 99100.
10. 50,500
Find the two multiples of 100 either side: 50400 and 50500. Look at the digit to the right of the rounding place: 5 or more rounds up. 50477 rounds to 50500.
11. 2,900
Find the two multiples of 100 either side: 2800 and 2900. Look at the digit to the right of the rounding place: 5 or more rounds up. 2890 rounds to 2900.
12. 6,100
Find the two multiples of 100 either side: 6100 and 6200. Look at the digit to the right of the rounding place: 5 or more rounds up. 6114 rounds to 6100.
Worked examples
Round 404 to the nearest 10.
- Find the two multiples of 10 either side: 400 and 410.
- Look at the digit to the right of the rounding place: 5 or more rounds up.
- 404 rounds to 400.
- Answer: 400
Round 180 to the nearest 10.
- Find the two multiples of 10 either side: 180 and 180.
- Look at the digit to the right of the rounding place: 5 or more rounds up.
- 180 rounds to 180.
- Answer: 180
Round 66,924 to the nearest 100.
- Find the two multiples of 100 either side: 66900 and 67000.
- Look at the digit to the right of the rounding place: 5 or more rounds up.
- 66924 rounds to 66900.
- Answer: 66,900
Interactive practice
Free, no account required — answer on screen or print it.
Common mistakes
What learners typically get wrong, and how to fix it.
Looks at the wrong digit to decide whether to round up.
Correction: Underline the rounding place, then circle the digit to its right.
Changes the digits after the rounding place to anything other than 0.
Correction: Every digit after the rounding place becomes 0.
Teacher tips
- · Use a number line showing the two multiples either side.
Parent tips
- · Estimate the shopping bill to the nearest dollar.
Real-life applications
- · Estimating the total of a shopping trip before paying.
Assessment objectives
How mastery is evidenced, and which standards it maps to.
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Frequently asked
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- Start with Working with Estimation in Context Common Errors: Visual Models, Working with Estimation in Context Common Errors: Worked Examples, Rules and Methods in Estimation in Context Common Errors. Each one has its own free lesson, worksheet and quiz.
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- What comes next after Working with Estimation in Context Common Errors: Common Mistakes?
- Move on to Working with Estimation in Context Common Errors: Real-life Applications, Introduction to Estimation in Context Common Errors, Key Vocabulary of Estimation in Context Common Errors, Rules and Methods in Estimation in Context Common Errors, which build directly on this idea.
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