Primary 4 · Mathematics · Rounding & Estimation
Rounding & Estimation questions for Primary 4 Maths
10 questions to work through online. Answer and you get the working straight away, then a score at the end. No sign-up, and you can retake it as often as you like.
- Rounding to the nearest 10
- Rounding to the nearest 100
- Rounding to the nearest 1000
- Estimating a sum
- Rounding money
- Reading a rounded number
- Estimating a difference
- Rounding in context
- Checking with estimation
Answers and explanations for all 10 questions
Every answer with the reasoning behind it. Worth reading after you have tried the set — or on its own, if you are a parent marking it.
Round 3 476 to the nearest 10.
Answer: 3480
The ones digit is 6, so 3476 rounds up to 3480.
Round 8 249 to the nearest 100.
Answer: 8200
The tens digit is 4, so 8249 rounds down to 8200.
Round 26 500 to the nearest 1000.
Answer: 27000
The hundreds digit is 5, and a half rounds up, so 26500 becomes 27000.
Estimate 4 812 + 3 195 by rounding each number to the nearest 1000.
Answer: 8000
4812 rounds to 5000 and 3195 rounds to 3000, so the estimate is 8000.
Round $24.68 to the nearest dollar.
Answer: $25.00
68 cents is past halfway, so $24.68 rounds up to $25.00.
A number rounded to the nearest 100 gives 4 300. Which of these could the number be?
Answer: 4280
Anything from 4250 to 4349 rounds to 4300, and 4280 is inside that range.
Round 995 to the nearest 10.
Answer: 1000
995 rounds up, and the 9 tens roll over into a new thousand: 1000.
Estimate 7 089 − 2 940 by rounding each number to the nearest 100.
Answer: 4200
7089 rounds to 7100 and 2940 rounds to 2900, so 7100 − 2900 = 4200.
A stadium holds 18 630 people. Rounded to the nearest 1000, how many people is that?
Answer: 19000
The hundreds digit is 6, which is 5 or more, so 18630 rounds up to 19000.
A pupil worked out 396 × 5 and wrote 1 480. Which estimate shows the answer must be wrong?
Answer: 2000
396 is close to 400, and 400 × 5 = 2000 — far from 1480, so the answer is wrong.