I created and used this set of mini part whole flash cards for my students to study the following addition/ subtraction facts: doubles, plus/ minus 1, plus/ minus 0 and make 10.
These part-part-whole concept comes from Singapore Math. The proportionately divided boxes make it easier for students to make connections when studying their addition facts.
Print these flash cards onto cardstock, laminate and cut. I had my students store their flash cards in a snack size ziploc bag or an envelope. They would keep them in their binders to practice at school and at home.