Your child is beginning to get very good at putting objects together to find a total. The next step is to encourage them to count on.
In Reception we only work up to the number 20. If these numbers are too big you can make the numbers lower for your child. If the numbers are too easy then try and encourage your child to write down the numbers for you or count in 2s.
We are beginning to count on from a given number. Children will need to put the first number in their head and by crossing out the pictures as they go count on. E.g. 6 in my head 7, 8.