⬇️ Round It Up
Sort falling numbers into the correct rounding bucket.
How to play
- Pick a sorting station and a difficulty tier, then click Start Sorting.
- A number appears with its two nearest round multiples marked on a line.
- Click the bucket for the correct rounded value before time runs out.
- Wrong bucket or too slow? Your streak resets, but you keep playing.
- Earn 🧺 buckets for every correct sort to unlock new stations.
A rounding game with real bucket-sorting pressure, not a flat worksheet
Round It Up is a free rounding game built around the two skills grade 3 and 4 classrooms actually test: rounding to the nearest 10 and rounding to the nearest 100, including the tricky tie case where a number ending in exactly 5 (or 50) always rounds up. Every round shows the number on a real number line stretched between its two nearest round multiples, so the correct bucket is something you can see, not just calculate in the abstract.
There's real timer pressure, sorting a number correctly before it runs out earns points and builds a streak, but missing never ends the session. A wrong bucket or a timeout just resets the streak and shows the correct answer, then moves straight to the next number. Six tiers scale from rounding to the nearest 10, through a tie-focused tier on numbers ending in 5, up to rounding to the nearest 100 and a mixed championship tier with less time to decide.
Every correct sort earns a bucket, and collecting enough buckets unlocks a new sorting station, from the starting Farm Stand through Factory Floor, Space Depot, Candy Line, and Wizard Sort. It's free, works with a mouse, touchscreen, or keyboard, needs no download or account, and saves your buckets and best streaks locally in your own browser. See the Parents & Safety page for the full privacy details, or browse the rest of the Math Games hub.
Frequently asked questions
How do I play Round It Up?
Look at the number and the number line between its two nearest round multiples, then click the bucket for the correct rounded value before the timer runs out.
What happens if I pick the wrong bucket or run out of time?
Your streak resets and the correct answer is shown, but the session keeps going. There's no life lost and no game over.
What's special about tiers 2 and 4?
They focus on numbers ending exactly in 5 (for tens) or 50 (for hundreds), the tie case where the rounding rule always rounds up.
How do I unlock new sorting stations?
Every correct sort earns buckets. Collecting enough buckets unlocks a new station permanently, from the starting Farm Stand up to Wizard Sort.