You have to put numbers in verticual, after put the symbol plus at left and next add the last number to the first number.
The process of calculating the number of times one number is contained within another one.
It resolved in cross products. That is, multiplying the figure of the number above by the one that acompanies it to the side and thus the same with the figure box.
A multiplication of fractions is done by multiplying the numerator by the numerator of the other, and the denominator by denominator of the other; obtaining the result
Square root a number Y is a number whose is a number A.
square (the result of multiplying the number by itself)