Question
612 x 15 + 513 x 15 + 816 x 15
= (a)            x 15
= (b)           
2 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

612 x 15 + 513 x 15 + 816 x 15
= (a)            x 15
= (b)