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204 square feet.

(17)(12)

(10+7)(10+2)

1(100)+9(10)+14(1)

100+90+14

204

The above process shows why the mental math multiplication of double-digit works. (product of first digit, cross multiplication of digits, product of second digit)

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12y ago
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Q: How many square feet in a 17 x 12 room?
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