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Dr. Green has to multiply the weight of the team’s bug spray bottles, 7 x 90 grams. To solve this, he writes out the equation 7 x 9 x 10.
It works because 7 x 9 x 10 is the same thing as 7 x 90, since 9 x 10 is just 90. So basically he is just writing more but the answer will still be the same.
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