British Columbia Grade 3 Math I use this project when I start my multiplication unit to teach repeated addition, groups of, commutative property, and arrays. You could also replace one with a multiplication word problem and picture.
EASY FOR CENTERS! Cut out the rectangles, cut on the two lines in the middle and your done! Laminate for use for years to come. Kids look at the number in the middle and find the two addition problems that have that sum!