Free Grade 3 Estimation in Context Common Errors Lessons
Free Grade 3 lessons for Estimation in Context Common Errors: 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
35 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain estimation in context common errors
Explain estimation in context common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate estimation in context common errors
Calculate estimation in context common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare estimation in context common errors
Compare estimation in context common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify estimation in context common errors
Justify estimation in context 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 Estimation in Context Common Errors 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 157 to the nearest 10.[1]
- 2.Round 314 to the nearest 10.[1]
- 3.Round 684 to the nearest 10.[1]
- 4.Round 637 to the nearest 10.[1]
- 5.Round 483 to the nearest 10.[2]
- 6.Round 5,758 to the nearest 10.[2]
- 7.Round 5,782 to the nearest 100.[2]
- 8.Round 9,808 to the nearest 100.[2]
- 9.Round 98,414 to the nearest 1,000.[3]
- 10.Round 73,146 to the nearest 1,000.[3]
- 11.Round 37,091 to the nearest 100.[3]
- 12.Round 51,995 to the nearest 100.[3]
Show answers and working
1. 160
Find the two multiples of 10 either side: 150 and 160. Look at the digit to the right of the rounding place: 5 or more rounds up. 157 rounds to 160.
2. 310
Find the two multiples of 10 either side: 310 and 320. Look at the digit to the right of the rounding place: 5 or more rounds up. 314 rounds to 310.
3. 680
Find the two multiples of 10 either side: 680 and 690. Look at the digit to the right of the rounding place: 5 or more rounds up. 684 rounds to 680.
4. 640
Find the two multiples of 10 either side: 630 and 640. Look at the digit to the right of the rounding place: 5 or more rounds up. 637 rounds to 640.
5. 480
Find the two multiples of 10 either side: 480 and 490. Look at the digit to the right of the rounding place: 5 or more rounds up. 483 rounds to 480.
6. 5,760
Find the two multiples of 10 either side: 5750 and 5760. Look at the digit to the right of the rounding place: 5 or more rounds up. 5758 rounds to 5760.
7. 5,800
Find the two multiples of 100 either side: 5700 and 5800. Look at the digit to the right of the rounding place: 5 or more rounds up. 5782 rounds to 5800.
8. 9,800
Find the two multiples of 100 either side: 9800 and 9900. Look at the digit to the right of the rounding place: 5 or more rounds up. 9808 rounds to 9800.
9. 98,000
Find the two multiples of 1000 either side: 98000 and 99000. Look at the digit to the right of the rounding place: 5 or more rounds up. 98414 rounds to 98000.
10. 73,000
Find the two multiples of 1000 either side: 73000 and 74000. Look at the digit to the right of the rounding place: 5 or more rounds up. 73146 rounds to 73000.
11. 37,100
Find the two multiples of 100 either side: 37000 and 37100. Look at the digit to the right of the rounding place: 5 or more rounds up. 37091 rounds to 37100.
12. 52,000
Find the two multiples of 100 either side: 51900 and 52000. Look at the digit to the right of the rounding place: 5 or more rounds up. 51995 rounds to 52000.
Worked examples
Round 405 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.
- 405 rounds to 410.
- Answer: 410
Round 9,044 to the nearest 100.
- Find the two multiples of 100 either side: 9000 and 9100.
- Look at the digit to the right of the rounding place: 5 or more rounds up.
- 9044 rounds to 9000.
- Answer: 9,000
Round 84,382 to the nearest 1,000.
- Find the two multiples of 1000 either side: 84000 and 85000.
- Look at the digit to the right of the rounding place: 5 or more rounds up.
- 84382 rounds to 84000.
- Answer: 84,000
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
- Is this Grade 3 Estimation in Context Common Errors lesson really free?
- Yes. Every lessons 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 Estimation in Context Word Problems, Estimation in Context Techniques, Working with Estimation. Each one has its own free lesson, worksheet and quiz.
- How is the lesson 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 Estimation in Context Common Errors?
- Move on to Introducing Estimation, Working with Estimation, which build directly on this idea.
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