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Bob has 10 cookies
Bill comes over and eats some of his cookies.
How many cookies did Bill eat if Bob now has only 2 cookies left?
10 – x = 2
The student could draw a number line and go to 10 and then count the jumps back to 2 and would know the answer is 8. Or the student could consider a scale. If you put 10 apples on one side and 2 on the other, how many would you have to remove from the left side to balance the scale?