To help students with Maths online is often challenging. Not being able to use concrete materials that students can hold and manipulate and not having direct face-to-face communication to work through demonstrate activities is part of this difficulty.
The Mathletics site: http://www.mathletics.com.au/ is subscription-based but well worth it! Within this site is Rainforest Maths which provides colourful images, especially important for visual learners, and fun ways to learn Maths throughout Primary School. For students who like to compete they can join other students online to test their skills and earn points to design their Avatar. If they encounter any learning difficulties, Mathletics provides examples that work through the steps to find a solution.