Let’s solve each part of the “Rounding to the Nearest Hundred” worksheet step by step.
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a. Write a 2-digit number that rounds to 100 when rounding to the nearest hundred.
- Rounding to the nearest hundred means we look at the tens digit.
- For a 2-digit number to round
up to 100, it must be
50 or greater (since 50–99 round up to 100).
- The smallest such number is
50, and any number from 50 to 99 works.
-
✔ Answer: 50 (or any number from 50 to 99 — e.g., 75, 99, etc.)
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b. Write a number less than 900 that rounds to 900 when rounding to the nearest hundred.
- Numbers that round to 900 are from
850 to 949.
- But we need a number
less than 900, so we pick from
850 to 899.
-
✔ Answer: 850 (or any number from 850 to 899 — e.g., 875, 899)
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c. When you are rounding numbers to the nearest hundred, what is the greatest number that rounds to 600?
- Numbers that round to 600 are from
550 to 649.
- The greatest number in this range is
649.
-
✔ Answer: 649
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d. When you are rounding numbers to the nearest hundred, what is the least number that rounds to 200?
- Numbers that round to 200 are from
150 to 249.
- The least number in this range is
150.
-
✔ Answer: 150
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e. When rounded to the nearest hundred, the number of buttons in Minie’s box is 400. Which could NOT be the actual number of buttons in her box? (Circle the correct choice.)
Options:
354 455 415 389
- Let’s round each:
- 354 → 400? → 354 is ≥ 350 →
rounds to 400 ✔
- 455 → 455 is ≥ 450 →
rounds to 500 ✘ → This does
NOT round to 400.
- 415 → 415 is between 400–449 →
rounds to 400 ✔
- 389 → 389 is ≥ 350 →
rounds to 400 ✔
✔ Answer: Circle 455
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f. When rounded to the nearest hundred, the number of pictures on Sebastian’s cell phone is 200. Which might be the actual number of pictures on his phone? (Circle the correct choice.)
Options:
139 150 250 267
- Round each:
- 139 → 100 (since < 150)
✘
- 150 → 200
✔
- 250 → 300
✘
- 267 → 300
✘
✔ Answer: Circle 150
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g. Leon has a 3-digit number written on an index card. The digits are 5, 1, and 9. When rounded to the nearest ten, his number is 920. What is the number on Leon’s card?
- Digits: 5, 1, 9 → possible 3-digit numbers: 159, 195, 519, 591, 915, 951
- We need the number that rounds to
920 when rounded to the
nearest ten.
- That means the number must be between
915 and 924 (inclusive), because:
- 915 → 920
- 916 → 920
- ...
- 924 → 920
- 925 → 930
Check our options:
- 915 → uses digits 9,1,5 →
✔ YES → rounds to 920
- 951 → 950 →
✘
- Others are too small or don’t round to 920.
✔ Answer: 915
---
h. Maria has a 3-digit number written on an index card. The digits are 9, 7, and 0. When rounded to the nearest hundred, her number is 700. What is the number on Maria’s card?
- Digits: 9, 7, 0 → possible numbers: 709, 790, 907, 970, 079 (invalid), 097 (invalid)
- Valid 3-digit numbers: 709, 790, 907, 970
- Must round to
700 → so number must be from
650 to 749
Check:
- 709 → 700
✔
- 790 → 800
✘
- 907 → 900
✘
- 970 → 1000
✘
Only
709 fits.
✔ Answer: 709
---
##
✔ Final Answers Summary:
a.
50 (or any 2-digit number from 50–99)
b.
850 (or any number from 850–899)
c.
649
d.
150
e.
Circle 455
f.
Circle 150
g.
915
h.
709
Let me know if you’d like a visual explanation or printable version!
Parent Tip: Review the logic above to help your child master the concept of rounding word problems worksheet.
