10080 inches
840 inches is 70 feet.
There are 12 inches in one foot. Therefore, 840 inches is equal to 840/12 = 70 feet.
840
30 feet by 28 feet equals 840 square feet. 30 inches by 28 inches equals 840 square inches, or 5.833 square feet.
840 inches is 2,133.6 centimeters.
1 foot = 12 inches. So, 70 feet = 70 x 12 = 840 inches.
12 inches per foot. 7 feet must be 84 inches so 70 feet is ten times that = 840
840 millimeters is 2 feet and 9.07 inches.
840 mm = 33.1 inches.
There are 5280 feet in one mile. Therefore, 4 miles 840 feet is equal to (4 x 5280) = 21120 + 840 = 21960 feet.
840 millimeters is 33.07 inches.
1 foot = 12 inches 70 ft = 70 x 12 = 840 in