Use a permanent marker to draw a part - part - whole diagram on the front of a ziploc bag; the whole should be the top portion. Pairs of students are assigned a number of objects to place in the bag. Once the bag is sealed, students separate the objects into two parts and record the addition sentence on the recording sheet. You can also set up math stations where each station focuses on a different number. This is a great activity because students can still see the objects in the bag! And if they forget how many objects they have, they can turn the bag upside down so that the objects fall into the "whole" section of the bag for counting.