Question

K + 1/4 = 5 1/8
It’s not 51 btw there’s a space

Answer 1

K=4.875 or 4 7/8. First you use the inverse property and do 5 1/8 -1/4= 4.875.
The inverse property is just using the opposite sign like addition with subtraction and multiplication with division. You would use the opposite sign in this case the total.

Answer 2

4.875because 5 1/8 = 41/8 - 1/4 = 4.875