My homework said"solve using the standard algorithm. check your quotient and remainder by using multiplication and addition."

84 divided by 2 = 42.

2 goes into 8 four times, so there would be your 4.
 Then 2 goes into 2 one time, and there would be your 2.

You check your answer by multiplying 42 by 2, which would give you, 84.

Answer) by studying proton collisions hope this : )