Write the numbers from 0-9 on a piece of paper. Then take a walk around the neighbourhood and see if you can find them all. Cross them off as you find them!
Hide the numbers 1-10 or 11-20 around the yard and have your child search for them and put them in order as they find them.
For an extra challenge do some mental math on your walk. If you see a house number like 812 what would the answer be if you added each number together. 8+1+2 = 11