Code  play with the Scratch code
 The Scratch code below simulates this math exploration:
 Start with __ + __ = 8
 Repeat 6 times:
 Roll a number cube to get the first number
 Calculate the second number
 Plot the pair of numbers on the grid
 Record the pair of numbers in the table
 Change the values in the code and see how the graph changes.

Output
 The graph plots six random pairs of numbers that satisfy the number sentence __ + __ = 8.
 Why do the points line up when they are random?
 Why do we sometimes see less than 6 points?
 Set the sum to a different number to see effect.
