This 30 page bundle includes two variations of each page.
Option 1: the student has to either find the missing part or missing whole
Option 2: The student has to find the missing part or missing whole, as well as write the addition problem underneath.
The third page is the key.
I have laminated these and used them with dry erase markers, I've made them center work, morning work or used them as a lesson assistant for part-part-whole lesson delivery.
Of course, at the end of the bundle, there are blanks of these printables for you to modify to your classroom needs.