K.CC.B.4

Understand the relationship between numbers and quantities; connect counting to cardinality.

Count and represent using fingers. Also count and represent using objects, such as counters, Unifix Cubes, base ten blocks, etc. Then represent by drawing. For example, draw circles to show the number:

Provide students with markers having a fat tip for drawing the circles.

Source: Page 10 of Go Math

TODO: I vaguely recall a Khan Academy practice where the student drags a number of objects into a bin. If the range of numbers is small, this might constitute a digital implementation.