Sunita has 75 pens and she ties them into bundles of 8. How many pens does she have left over?

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The bundles of pens are in 8s, so let's start counting up in 8s. 8, 16, 24, 32, 40, 48, 56, 64, 72, 80. Now, we must stop before the number of pens she has because you can't tie up pens that are not there! The closest number to 75 that is below 75 is 72. Therefore, she will have 75 - 72 = 3 pens left over.

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