First I would like you to print out the number cards 1-20 below or you can write the numbers yourself on small pieces of paper.
Now I would like you to jumble them up so that they are not in order. Let your grownup flash them to you. What number can you see, can you say it out loud? Can you say all the numbers to 20?
Now, can you find 20 small items to count in your house. It can be uncooked pasta, raisins, buttons, shoes, socks, cutlery- anything that is not too bulky and large.
Put the number cards upside down on the floor/carpet and pick one card at a time. Say that number out loud and count out that number of objects. Put it back and repeat it with different numbers.
If your child finds it tricky to do numbers to 20, then use numbers to 10 or 15.