Effective yet simple. Both of my kids LOVE math and numbers so this was a perfect activity for Ollie (4). He worked on recognizing numbers and counting while he daubed the numbers in order from 1-30!  Adapt the numbers according to what your child is working on. If your child doesn’t recognize numbers yet you could write the numbers 1-10 on the paper and then put the same amount of dots next to each number. That way they can count the dots to know which number is which!