where is the fraction key symbol on the key board?

my problem is 3 1/8 + 4 11/12 +3 1/10 + 2 4/5

I can't find a fraction key either.

Find the LCD (lowest common denominator), which seems to be 120. Express the whole numbers with their fractions in terms of this denominator and then add the values.

I hope this helps. Thanks for asking.