Primary 4 Mathematics · Chapter 1 · Answers and explanations
Lesson 1.5: Rounding to the Nearest 10
Use this page to check the practice sheet together. Talk about why each answer is right. Total: 14 marks.
Section A · Multiple choice 4 marks
1. Round 3846 to the nearest 10.1 mark
(A) 3840(B) 3850(C) 3800(D) 3900
Answer: (B) 3850The ones digit is 6, which is 5 or more, so round up to 3850.
2. Round 52 394 to the nearest 10.1 mark
(A) 52 400(B) 52 300(C) 52 390(D) 52 399
Answer: (C) 52 390The ones digit is 4, which is less than 5, so round down to 52 390.
3. Between which two tens does 7265 lie?1 mark
(A) 7200 and 7300(B) 7260 and 7270(C) 7250 and 7260(D) 7265 and 7275
Answer: (B) 7260 and 7270The tens before and after 7265 are 7260 and 7270.
4. Which number rounds to 4580 to the nearest 10?1 mark
(A) 4574(B) 4565(C) 4576(D) 4593
Answer: (C) 45764576 has ones digit 6, so it rounds up to 4580. The others round to 4570, 4570 and 4590.
Section B · Write your answer 10 marks
5. Round 69 998 to the nearest 10.1 mark
Answer: 70 000The ones digit is 8, so round up. 69 990 becomes 70 000.
6. Round 10 005 to the nearest 10.1 mark
Answer: 10 010The ones digit is 5, so round up to 10 010.
7. Round 8531 to the nearest 10.1 mark
Answer: 8530The ones digit is 1, so round down to 8530.
8. Complete: 27 645 ≈ ______ (nearest 10)1 mark
Answer: 27 650The ones digit is 5, so round up to 27 650.
9. Write the smallest whole number that rounds to 340 to the nearest 10.1 mark
Answer: 335335 has ones digit 5, so it rounds up to 340. 334 rounds down to 330.
10. Write the greatest whole number that rounds to 340 to the nearest 10.1 mark
Answer: 344344 has ones digit 4, so it rounds down to 340. 345 rounds up to 350.
11. A shop has 4876 stamps. About how many stamps is that, to the nearest 10?1 mark
Answer: 4880The ones digit is 6, so round up to 4880.
12. Jay rounded 6725 to 6720 to the nearest 10. Is he correct? Explain.3 marks
Answer: No. The ones digit is 5, so he should round up to 6730.A ones digit of 5 or more rounds up, so 6725 ≈ 6730.
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