As usual I specialize in simple black and white fun useable lessons for Kindergarten and 1st grade.
This is M&M Subtraction. Simply print and give the students 20(Kindergarten) or more standard color M&Ms have them put the start number in the "I have" circle, and then count the number of M&Ms in the color listed. Once the write the number they can eat that color and count what is left.
Have the students repeat this with all the colors until they reach 0
Simple fun and effective end of subtraction unit activity.