Use two of the eights to form 88.
Then:
88 - 8 = 80
80 x 8 = 640
80 x 8 = 640
(88-8)x8= 640
These equal 640: 1 x 640, 2 x 320, 4 x 160, 5 x 128, 8 x 80, 10 x 64, 16 x 40, 20 x 32
2 x 4 x 8 x 10 is equal to 640.
1920
0.0125
640 ÷ 8 = 80
640 ÷ 8 = 80.
80
NO, 640 ACRES IS A SQUARE MILE
80 x 8 = 640
640 ÷ 8 × 6 = 480