Yes. three eights plus one eight equals 4 eights, or one half
seven eights. 1 half = 4 eights add 3 eights and you get 7 eights.
it is 6 eights or 3/4
One and one eighths.
one and seven eighths
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.
Four Eighths are equal to 1/2.
Five eights plus two thirds minus one fourth is equal to 1.04
Five eights plus seven eights is twelve eights. 12/8 is 8/8 and 4/8 is 1 4/8 is 1 1/2 (one and a half)