I have provided some guidance for supporting with reading and writing here is a couple of ideas for maths:
When amounts get larger, your child may need to slow down their counting and really point to/move the object as they’re counting.
If you child is not sure, you could say the last few numbers before and pause at the number eg: 5, 6….? or say it is 1 more than 6 or one less than 8.
Adding and taking away
Provide them with objects/ or encourage them to use their fingers to physically be able to add and take away. It is not an expectation that they are to do this in their heads.