We use Ten Town in school to support the children in their Mathematical learning. We have been able to give parents access to this at home. Each child has been given a username/password (please ask a member of staff if you do not have this) and instructions to how to log into it at home.
You could use Ten Town to focus on a number (one a day) and do activities based on that number. You could find that number of objects (e.g. 5 cars, 5 spoons, 5 red socks etc.), you could find how many ways you could make that number using addition or subtraction and write this as a number sentence.
Why not set up a tuck shop where children are paying for their snacks with real money. They could create a price board and pay with the coins. They could pay using 1p coins or a combination of coins. You may want to introduce giving change!
Here are a few websites that will help support your child's Mathematical learning.