How to calculate the sum of figures in a row, in excel?

the right method is sum(Range of cells..) function / if you add some rows the function will edited automaticilly / if some cells is not digitals ( string) wil not affect your function ; othrewise using (a1+b1     ) may result  un coreect 

1. You can Use Short Cut Key:   Alt + =

2. Use Auto Sum  ∑  Button in Top Right buttons (in Home Ribbon)

3. Enter Formula in the required Cell:  =sum(1st cell reference:last cell reference)

in the use microsoft excel shift cells down and shift cell right option ,the right method is sum ( 1a,1b)Range of cells function / if you add some rows the function will edited automaticilly / if some cells is not digitals string wil not affect your function ;rows colms and othrewise using a1+b1may result  un coreect