In mathematics education  number sense can refer to an intutive understanding of numbers, their magnitude,relationships,and how they are affected by operations.

    In non human animals number sense  is not the ability to count but the ability to perceive changes in the number of things in a collection.We can practice number sense with place value activities.

  Example 1) Practice making group of ten things 

  2) Make groups of ten to get to the 100 th day