Sum Stacks

Sum Stacks Screenshot
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At the top of your screen are several target numbers. Use the red, green, yellow and purple numbers to make each target number. Each color corresponds to a different mathematical operation. If you drop a number of one color onto another, the mathematical operation the number that is dropped is applied (so if you drop x3 onto +2, the answer will be 6, but if you drop the +2 onto x3, the answer will be 5.)