Explanations:
https://www.mathsisfun.com/decimals.html
https://www.mathsisfun.com/ordering_decimals.html
https://www.mathsisfun.com/ordering_decimals.html
Online Practice:
http://www.mathopolis.com/questions/q.php?id=5905&site=1&ref=/ordering_decimals.html&qs=5905_5906_5907_5908_956_957_1334_1335_3593_3594
https://www.mathsisfun.com/numbers/ordering-game.php?m=Dec-Tricky
https://www.mathsisfun.com/numbers/ordering-game.php?m=Dec-Tricky