Free Grade 3 Estimation in Context Common Errors Lesson Plans
Free Grade 3 lesson plans 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
Core
15 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 101 to the nearest 10.[1]
- 2.Round 286 to the nearest 10.[1]
- 3.Round 390 to the nearest 10.[1]
- 4.Round 426 to the nearest 10.[1]
- 5.Round 4,047 to the nearest 10.[2]
- 6.Round 5,801 to the nearest 10.[2]
- 7.Round 1,787 to the nearest 10.[2]
- 8.Round 4,849 to the nearest 10.[2]
- 9.Round 24,482 to the nearest 100.[3]
- 10.Round 83,381 to the nearest 1,000.[3]
- 11.Round 25,258 to the nearest 1,000.[3]
- 12.Round 24,147 to the nearest 1,000.[3]
Show answers and working
1. 100
Find the two multiples of 10 either side: 100 and 110. Look at the digit to the right of the rounding place: 5 or more rounds up. 101 rounds to 100.
2. 290
Find the two multiples of 10 either side: 280 and 290. Look at the digit to the right of the rounding place: 5 or more rounds up. 286 rounds to 290.
3. 390
Find the two multiples of 10 either side: 390 and 390. Look at the digit to the right of the rounding place: 5 or more rounds up. 390 rounds to 390.
4. 430
Find the two multiples of 10 either side: 420 and 430. Look at the digit to the right of the rounding place: 5 or more rounds up. 426 rounds to 430.
5. 4,050
Find the two multiples of 10 either side: 4040 and 4050. Look at the digit to the right of the rounding place: 5 or more rounds up. 4047 rounds to 4050.
6. 5,800
Find the two multiples of 10 either side: 5800 and 5810. Look at the digit to the right of the rounding place: 5 or more rounds up. 5801 rounds to 5800.
7. 1,790
Find the two multiples of 10 either side: 1780 and 1790. Look at the digit to the right of the rounding place: 5 or more rounds up. 1787 rounds to 1790.
8. 4,850
Find the two multiples of 10 either side: 4840 and 4850. Look at the digit to the right of the rounding place: 5 or more rounds up. 4849 rounds to 4850.
9. 24,500
Find the two multiples of 100 either side: 24400 and 24500. Look at the digit to the right of the rounding place: 5 or more rounds up. 24482 rounds to 24500.
10. 83,000
Find the two multiples of 1000 either side: 83000 and 84000. Look at the digit to the right of the rounding place: 5 or more rounds up. 83381 rounds to 83000.
11. 25,000
Find the two multiples of 1000 either side: 25000 and 26000. Look at the digit to the right of the rounding place: 5 or more rounds up. 25258 rounds to 25000.
12. 24,000
Find the two multiples of 1000 either side: 24000 and 25000. Look at the digit to the right of the rounding place: 5 or more rounds up. 24147 rounds to 24000.
Worked examples
Round 813 to the nearest 10.
- Find the two multiples of 10 either side: 810 and 820.
- Look at the digit to the right of the rounding place: 5 or more rounds up.
- 813 rounds to 810.
- Answer: 810
Round 8,470 to the nearest 100.
- Find the two multiples of 100 either side: 8400 and 8500.
- Look at the digit to the right of the rounding place: 5 or more rounds up.
- 8470 rounds to 8500.
- Answer: 8,500
Round 79,309 to the nearest 100.
- Find the two multiples of 100 either side: 79300 and 79400.
- Look at the digit to the right of the rounding place: 5 or more rounds up.
- 79309 rounds to 79300.
- Answer: 79,300
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 plan really free?
- Yes. Every lesson plans 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 plan 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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