Rounding Riddles
Read the clues. Find the mystery number.
Fresh sheet anytime. Tap New sheet or reload for a different one. Tap + for up to 10.
This is sheet #73024601.
How to do it
- Read every clue.
- List the numbers that fit the first clues.
- Cross off numbers until only one is left.
Teaching tip
Writing the possible numbers in a list makes the riddles much easier. This sheet is aligned with Common Core 3.NBT.A.1.
About this worksheet
Mystery number riddles with rounding, odd and even, and digit clues.
What kids practice
Rounding finds the nearest ten or hundred, so 47 rounds to 50 and 362 rounds to 400. Third graders round numbers up to 1,000 by thinking about which ten or hundred a number is closer to on a number line. Rounding makes numbers easier to work with, and children use it to estimate answers and check that they make sense.
Watch for
- Looking at the wrong digit, like the ones digit when rounding to the nearest 100.
- Changing the digits that should stay, like rounding 348 to 400 when rounding to the nearest 10.
- Rounding 45 down to 40. A 5 rounds up.
It's free to print, with Fewer, Standard or More on the page and an answer key. See the full rounding to 10 and 100 guide for 3rd grade.
More sheets in this set
- See it all
1. Rounding ChartNumber lines showing 47 rounds to 50 and 362 rounds to 400, the "5 or more" rule, and one number rounded two ways. 
2. Round on a Number Line (10s)Number lines between two tens. Mark the number, then circle the nearest ten.
3. Round on a Number Line (100s)Number lines between two hundreds, with a tick every 10. Mark the number, then circle the nearest hundred.
4. Round to the Nearest 10Two- and three-digit numbers to round to the nearest ten, like 63 → 60 and 347 → 350.
5. Round to the Nearest 100Numbers to round to the nearest hundred, like 348 → 300 and 750 → 800.
6. Round Both WaysA table to round each three-digit number to the nearest 10 and the nearest 100.