When you need to find a certain amount of a number, first try to divide the number by the number of parts in the whole.
Meaning 80, we need to find 3/8th's, so try to see If 80 can be divided by 8.
80/8 = 10. Which means that 1/8th of 80 is 10. Knowing this we can deduce that 3/8th of 80 is 30.
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Seven eights plus three eights is ten eights. Now, possibly you intended to ask about eighths, rather than eights. Ten eighths is equal to one and a quarter. However, ten eights is equal to 80. The extra h makes a difference.
if 4 and eight eights is subtracted by 3 and three eights, then you get 1 and five eights
No
Three quarters is the simplest form for six eights. For five eights there is no simpler form.
-- "Three eights" is 24. That's way bigger than three fifths.-- Three eighths is 37.5% less than three fifths.