Rounding Numbers to 10 and 100
Round each number to the nearest 10 or 100 as directed. Circle the correct answer where choices are given.
1. Round 47 to the nearest 10.
Answer: ___________
2. Round 362 to the nearest 100.
Answer: ___________
3. Round 85 to the nearest 10.
Answer: ___________
4. Round 749 to the nearest 100.
Which is correct?
- A) 700
- B) 800
- C) 750
- D) 740
Answer: ___________
5. Round 34 to the nearest 10.
Which is correct?
- A) 40
- B) 30
- C) 35
- D) 20
Answer: ___________
6. Fill in the blanks:
- 255 rounded to the nearest 10 is ___________.
- 255 rounded to the nearest 100 is ___________.
7. Word Problem:
Mia scored 386 points in a video game. Her brother rounded her score to the nearest 100 to tell their dad. What number did he say?
Answer: ___________
8. ⭐ Challenge:
I am a number between 540 and 550. When rounded to the nearest 10, I round up to 550. When rounded to the nearest 100, I round down to 500. What could I be? List all possible answers.
Answer: ___________
Answer Key
1. 47 rounded to the nearest 10 = 50
(47 is between 40 and 50; the digit 7 ≥ 5, so round up)
2. 362 rounded to the nearest 100 = 400
(362 is between 300 and 400; the digit 6 ≥ 5, so round up)
3. 85 rounded to the nearest 10 = 90
(the digit 5 means round up)
4. 749 rounded to the nearest 100 = B) 800
(749 is between 700 and 800; the digit 4… wait — tens digit is 4 < 5, so round down)
✏️ Correction: Answer is A) 700
5. 34 rounded to the nearest 10 = B) 30
(the digit 4 < 5, so round down)
6.
- 255 rounded to the nearest 10 = 260 (5 rounds up)
- 255 rounded to the nearest 100 = 300 (5 rounds up)
7. 386 rounded to the nearest 100 = 400
(the tens digit 8 ≥ 5, so round up)
8. ⭐ Challenge: Numbers between 540 and 550 that round up to 550 are: 545, 546, 547, 548, 549
(545–549 have a units digit ≥ 5, so they round up to 550; all are less than 550 so they round down to 500 for the nearest 100)
Possible answers: 545, 546, 547, 548, 549