Rounding Game for Kids: Rounding Rally
Rounding Rally is a free rounding game that helps children round whole numbers to the nearest 10, 100 or 1,000, and round decimals to the nearest whole number or tenth.
Rounding Rally
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- Ages
- 7–12
- School years
- Grade 2–Grade 6
- Skills
- Rounding to the nearest 10, 100 and 1,000, Rounding decimals to the nearest whole number and tenth, Using the "5 or more rounds up" rule
- Time
- 2–5 minutes a round
- Cost
- Free, no sign-up
- Updated
How to play Rounding Rally
- Choose what to round to: nearest 10, 100, 1,000, or decimals.
- Pick whether to tap an answer or type it.
- Use the number line: it shows the two values the number sits between and the halfway point.
- Remember: if the number is exactly halfway, it rounds up!
What your child learns
- Rounding to the nearest 10, 100 and 1,000
- Rounding decimals to the nearest whole number and tenth
- Using the "5 or more rounds up" rule
- Placing numbers on a number line
- Estimating answers to check calculations
About Rounding Rally
Rounding is the key to estimation: it lets children check whether an answer is sensible, work out rough totals in their heads and make sense of big numbers. Every question shows a number line with the two possible answers, so children can see which one the number is closer to, not just memorise a rule.
Most children start rounding to the nearest 10 in Grades 2–3, move on to 100 and 1,000 in Grades 3–4, and round decimals in Grades 5–6. Halfway numbers such as 45 or 3.5 appear often, so the rule that 5 rounds up becomes automatic.
Which level should my child play?
| School year | Suggested level |
|---|---|
| Grade 2 | Nearest 10 |
| Grade 3 | Nearest 100 |
| Grade 4 | Nearest 1,000 |
| Grade 5 | Decimals |
| Grade 6 | Decimals + Typing |
Move up a level after getting three stars two or three times in a row.
🏆 Leaderboard
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🖨️ Printable worksheets
Practise away from the screen too: free worksheets with answer keys that match this game.
🎯 Practise one skill
Jump straight to a level, with tricks, examples and a printable worksheet for each skill.
Frequently asked questions
How do you round to the nearest 10?
Look at the ones digit. If it is 5 or more, round up to the next ten; if it is less than 5, round down. So 47 rounds to 50 and 43 rounds to 40.
Why does 5 round up?
A number ending in 5 is exactly halfway, so it is equally close to both tens. Mathematicians agreed on a simple rule to round halfway numbers up, so everyone gets the same answer.
What age do children learn rounding?
Rounding to the nearest 10 and 100 is usually taught around ages 7 to 9, and rounding decimals around ages 10 to 12.
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Help your child shine in math
Practice at home is a great start. Success Tutoring offers personalised tutoring to build skills and confidence.