640 ÷ 8 = 80
8 with remainder 8.
8 x 8 = 648 x 80 = 6408 times with 3 remaining643 - 3 = 640 = 80 x 8
80 x 8 = 640
80 x 8 = 640
80 x 8 = 640
640 ÷ 8 × 6 = 480
64 + 640 = 704
(160 × 8), (256 × 5), (320 × 4), (640 × 2)
You can fit 8 79s in 640. To figure this out, divide 640 by 79. 640 divided by 79 equals 8.08, so 8 79s will fit in 640.
80/640 times 100 = 12.5% or in reduced terms 1/8 times 100 = 12.5%
640 rupees is approximately £8