Estimate a number of objects; round two-digit numbers to the nearest 10 × Rounding - Crystal Crash Throw your pickaxe at the correct crystal. This game has the following levels (taken from the new maths curricululum): 1. Round numbers up to 100 to the nearest 10 (Y2) 2. Round numbers up to 1000 to the nearest 10 (Y3) 3. Round numbers up to 10,000 to the nearest 10, 100 or 1000 (Y4) 4. Round decimals with one decimal place to the nearest whole number (Y4) 5. Round decimals with two decimal places to the nearest whole number and to one decimal place (Y5) 6.Round decimals with up to three decimal places to the nearest whole, one decimal place or two decimal places (Y6) This game, together with all the other crystal crash games, is available as a single iPad or Android app. Game availability: Online in HTML5 format Close Rounding - Crystal Crash ? × Rounding This game can be played for free until 1st August 2018, after which it will be available to subscribers only. Round 3-digit or 4-digit numbers to the nearest 10 or 100. Round decimals to the nearest whole number, or to 1 decimal place. Game availability: Online in Flash format Close Rounding ?