1/4 + 3/8 = 5/8
It is: 1/4 plus 3/8 = 5/8
It is ten eights, or one and two eights or one and a quarter or 1.25 as a decimal.
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.
4 and a half
5
one and three-eights
It is: 1.75+3.25 = 5
Two One-eighth + one-eighth = one quarter
5/8
Three quarters.
Two eights are the same as one quarter (1/4, 0.25 or 25%)
two eights make one quarter so it takes threes times as many to make three quarters. So, 6 eights make three quarters. ( A eighth of a dollar is called a bit so 2 bits is a quarter and 6 bits is 75 cents. There is an old song that ends with "Shave and a haircut - six bits.)