Question
616 x 13 + 312 x 13 + 513 x 13
= (a)            x 13
= (b)           
2 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

616 x 13 + 312 x 13 + 513 x 13
= (a)            x 13
= (b)