Primary 4 Mathematics · Chapter 1 · Answers and explanations
Lesson 1.6: Rounding to the Nearest 100
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 4372 to the nearest 100.1 mark
(A) 4300(B) 4400(C) 4370(D) 4380
Answer: (B) 4400The tens digit is 7, which is 5 or more, so round up to 4400.
2. Round 18 250 to the nearest 100.1 mark
(A) 18 200(B) 18 250(C) 18 300(D) 19 000
Answer: (C) 18 300The tens digit is 5, so round up to 18 300.
3. Round 9951 to the nearest 100.1 mark
(A) 9900(B) 9950(C) 9990(D) 10 000
Answer: (D) 10 000The tens digit is 5, so round up: 9900 becomes 10 000.
4. Between which two hundreds does 56 740 lie?1 mark
(A) 56 000 and 57 000(B) 56 700 and 56 800(C) 56 600 and 56 700(D) 56 740 and 56 840
Answer: (B) 56 700 and 56 800The hundreds before and after are 56 700 and 56 800.
Section B · Write your answer 10 marks
5. Round 23 849 to the nearest 100.1 mark
Answer: 23 800The tens digit is 4, so round down to 23 800.
6. Round 70 050 to the nearest 100.1 mark
Answer: 70 100The tens digit is 5, so round up to 70 100.
7. Round 5499 to the nearest 100.1 mark
Answer: 5500The tens digit is 9, so round up to 5500.
8. Round 99 960 to the nearest 100.1 mark
Answer: 100 000The tens digit is 6, so round up. 99 900 becomes 100 000.
9. Which digit decides when you round 6384 to the nearest 100?1 mark
Answer: 8 (the tens digit)To round to the nearest 100, look at the tens digit. It is 8, so round up to 6400.
10. Write the smallest and the greatest whole numbers that round to 8200 to the nearest 100.2 marks
Answer: smallest 8150; greatest 82498150 has tens digit 5, so it rounds up to 8200. 8249 has tens digit 4, so it rounds down to 8200.
11. A stadium has 34 580 seats. How many is that, to the nearest 100?1 mark
Answer: 34 600The tens digit is 8, so round up to 34 600.
12. Round 3450 to the nearest 10 and to the nearest 100.2 marks
Answer: nearest 10: 3450; nearest 100: 3500The ones digit is 0, so it stays 3450 to the nearest 10. The tens digit is 5, so round up to 3500 to the nearest 100.
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