Which expression can be used to check each equation 646:3?

I'm pretty sure I did'nt understand your question but here is the answer to

what is 646 divided by 3 is:

215.333333333

If a/b=c then therefor a=b times c

so if 646/3=c then we can check our answer by checking if 646=3c is true where 3c means 3 times c

if 646/3=c then

the expression is 3c=646