This number line game can be used for all ages, depending on the hardness of numbers.

Set up a sort of washing line across the room. If it goes across the kids heads it will make it much for fun for them and they will all participate!
Hand round numbers to as many children as possible (have more than one set so the cycle can be repeated with those who didn't have a go the first time).

The pupils then put numbers on the number line in the right order. A fun and easy way to practice for those strugglers and visual learners.

W Tebbatt has suggested an extension to this idea... "I teach 3 classes of ascending ages 'on the bounce' and the number line was still up in the room when the 2nd class arrived. We mixed up the numbers and timed how long it took the kids to solve the muddle. When the eldest class came in I challenged them to put the numbers in the correct order but they could only swap 2 numbers at a time. A quick and easy way to introduce bubble sorting."