Expand and simplify. (3x+1)(2x+4)

First (3x*2x)+(3x*4)+(1*2x)+(1*4)
(6x^2)+(12x)+(2x)+(4)
6x^2+14x+4 (devide by 2)
3x^2 +7x +2

That question means: 894 + 10.
Let's do it by steps:

894 + 10 ... We take one of the 10, and add it to the 894.
895 + 9... We take one from 9, and add it to the 895
896 + 8 ... etc
897 + 7...
898 + 6
899 + 5
900 + 4
901 + 3
902 + 2
903 + 1
904 + 0 .. and now we're done. So that's 904.