There are many ways to help your child develop strong number sense...
Counting forward and backward within a hundred are a must.
Counting by 2's and 3's and 5's and 10's. Adding 10 more or 10 less to a number as well.
Starting at any number and counting by 10's.
Know doubles facts fluently.
Talking about time.
Counting spare change.
Working on puzzles.
Cooking a favorite family recipe.