you would want to find a common denominator -- in this case 160 is the largest common denominator
800/160=5
640/160=4
therefore the ratio would be 5:4 (said "5 to 4")
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percentage = 80%% rate:= 640/800 * 100%= 0.80 * 100%= 80%
640/52 = 160/13
Deducting 20% off 800 would be 800-160 which is 640
4/5
if this is asking whats half of 640 then the answer is 320