Group Activity Cards
Use groups of 3.
Materials: Grid paper, ruler, calculator

What is the Change? 
Each group member should take two sheets of grid paper. Fold each sheet in half lengthwise. Then fold the grid paper in half widthwise. Unfold the paper and you should have four equal sections on each sheet of grid paper. Using these fold lines, cut each sheet into four equal parts to create a total of eight "cards."
Use a ruler to draw eight differentsized rectangles on each one of your eight cards. Group all 24 cards together, shuffle, and place them face down in two stacks of 12 cards each. Label the two stacks A and B. Decide who will be player 1, player 2, and player 3. Player 1 begins by taking the top cards from Stack A and Stack B. Using scratch paper and/or a calculator, Player 1 then finds the percent of change in area from Rectangle A to Rectangle B. Players 2 and 3 check this answer.
A correct answer receives 5 points. If the answer is determined to be incorrect, 5 points go to the player(s) finding the correct answer. Play continues with player 2 choosing the next card in each stack and finding the percent of change from the new Rectangle A to the new Rectangle B, and so on. The player with the most points after all cards have been used wins.
