An important final step in problem solving before mathematically solving an equation is-?

Question

A) checking units, B) saving your calculations,C) seeing if the answer is reasonable, or D) checking your results with another student.

Answer 1

I'll go with all of the above. Although (D) may be frowned-upon during a test. And I'm not sure what they mean by (B), but it sounds like a good idea. Definitely check units and reasonableness though.

Answer 2

I'm sorry, but your answers do not jibe with your statement "before solving." A through D are things I'd do after solving...to make sure my solution had A the right units, B was saved, C reasonable, and D agreed with the A student at the next desk.

Anyway, do all the above after solving your problem to increase the chance you had the right answer and you have the way you solved it when reviewing for exams.

Answer 3

Before mathematically solving, you need to check your units. Make sure everything is in SI units, and convert if you need to BEFORE performing any calculations.

This will prevent subtle mistakes from creeping into your answer.

Answer 4

A and C would be the two most obvious things you should do. A would usually indicate an error in equation manipulation where C would usually indicate a calculation error.

Answer 5

All of the above unless you are taking an exam where D is not an ethical choice