Free Grade 3 Working with Introducing Estimation Common Errors Lessons
Free Grade 3 lessons for Working with Introducing Estimation 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
20 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- UnderstandExplain working with introducing estimation common errors
Explain working with introducing estimation common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with introducing estimation common errors
Calculate working with introducing estimation common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with introducing estimation common errors
Compare working with introducing estimation common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- EvaluateJustify working with introducing estimation common errors
Justify working with introducing estimation 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 Estimation 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 373 to the nearest 10.[1]
- 2.Round 845 to the nearest 10.[1]
- 3.Round 765 to the nearest 10.[1]
- 4.Round 830 to the nearest 10.[1]
- 5.Round 1,392 to the nearest 10.[2]
- 6.Round 5,180 to the nearest 100.[2]
- 7.Round 5,546 to the nearest 10.[2]
- 8.Round 3,357 to the nearest 10.[2]
- 9.Round 5,653 to the nearest 100.[3]
- 10.Round 41,938 to the nearest 1,000.[3]
- 11.Round 15,874 to the nearest 1,000.[3]
- 12.Round 14,259 to the nearest 100.[3]
Show answers and working
1. 370
Find the two multiples of 10 either side: 370 and 380. Look at the digit to the right of the rounding place: 5 or more rounds up. 373 rounds to 370.
2. 850
Find the two multiples of 10 either side: 840 and 850. Look at the digit to the right of the rounding place: 5 or more rounds up. 845 rounds to 850.
3. 770
Find the two multiples of 10 either side: 760 and 770. Look at the digit to the right of the rounding place: 5 or more rounds up. 765 rounds to 770.
4. 830
Find the two multiples of 10 either side: 830 and 830. Look at the digit to the right of the rounding place: 5 or more rounds up. 830 rounds to 830.
5. 1,390
Find the two multiples of 10 either side: 1390 and 1400. Look at the digit to the right of the rounding place: 5 or more rounds up. 1392 rounds to 1390.
6. 5,200
Find the two multiples of 100 either side: 5100 and 5200. Look at the digit to the right of the rounding place: 5 or more rounds up. 5180 rounds to 5200.
7. 5,550
Find the two multiples of 10 either side: 5540 and 5550. Look at the digit to the right of the rounding place: 5 or more rounds up. 5546 rounds to 5550.
8. 3,360
Find the two multiples of 10 either side: 3350 and 3360. Look at the digit to the right of the rounding place: 5 or more rounds up. 3357 rounds to 3360.
9. 5,700
Find the two multiples of 100 either side: 5600 and 5700. Look at the digit to the right of the rounding place: 5 or more rounds up. 5653 rounds to 5700.
10. 42,000
Find the two multiples of 1000 either side: 41000 and 42000. Look at the digit to the right of the rounding place: 5 or more rounds up. 41938 rounds to 42000.
11. 16,000
Find the two multiples of 1000 either side: 15000 and 16000. Look at the digit to the right of the rounding place: 5 or more rounds up. 15874 rounds to 16000.
12. 14,300
Find the two multiples of 100 either side: 14200 and 14300. Look at the digit to the right of the rounding place: 5 or more rounds up. 14259 rounds to 14300.
Worked examples
Round 297 to the nearest 10.
- Find the two multiples of 10 either side: 290 and 300.
- Look at the digit to the right of the rounding place: 5 or more rounds up.
- 297 rounds to 300.
- Answer: 300
Round 517 to the nearest 100.
- Find the two multiples of 100 either side: 500 and 600.
- Look at the digit to the right of the rounding place: 5 or more rounds up.
- 517 rounds to 500.
- Answer: 500
Round 67,586 to the nearest 100.
- Find the two multiples of 100 either side: 67500 and 67600.
- Look at the digit to the right of the rounding place: 5 or more rounds up.
- 67586 rounds to 67600.
- Answer: 67,600
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
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- Start with Rules and Methods in Introducing Estimation Common Errors, Key Vocabulary of Introducing Estimation Common Errors, Introducing Estimation Word Problems. Each one has its own free lesson, worksheet and quiz.
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- Recognition first, then understanding, application, reasoning and finally mastery — the same ladder used across every free resource on the platform.
- What comes next after Working with Introducing Estimation Common Errors?
- Move on to Introducing Estimation Common Errors in Examinations, Introducing Estimation Essentials, Introducing Estimation Techniques, Introducing Estimation Word Problems, which build directly on this idea.
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