Doesn't make them correct though!!!

(Again this is just my opinion)

It is the same just written out differently. (Sorry I hope I didn't imply that your answer was wrong)

Thank you very much for your help.

This is a great test of understanding of the number operations.

Just tried it on D2 - and she made same mistake I would have made -(although knowing answer in advance made it somewhat easier for me!).

She chose e), forgetting that the whole sum was times 2 so you need to add 2 not 1 to the final answer.

Hard - I wonder how many would get it right?