Addition Squares, great math for sub teachers, relief teachers, early finishers This is a great little free no prep printable product. A really good way to get students to practice their addition facts. They add the numbers across and down, and then add the totals together. I find this to be a fantastic activity when you just a have a little bit of time to fill or for early finishers who need a bit of extention. Most suitable for capable kindergarteners, grade one, and grade two students.