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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12 x 12 = 144 144 square feet
20.07 square meters
10 feet x 12 feet = 120 square feet
If the dimensions are in feet then there are: 4 times 3 = 12 square feet
192 = 12 x 16