Complete each butterfly by selecting a left and right wing and adding the numbers on the wings together to equal the number on the body of the butterfly.
Drag the wings to one of the butterfly bodies so that the number on the butterfly body is equal to the sum of the wings.
If you have selected the correct total, the butterfly will fly to the top of the page. If incorrect, the butterfly will fall to the bottom.
Continue until there are wings attached to the four butterfly bodies.
(Discuss any incorrect answers and the strategies that the students used to determine the combinations of numbers.)