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SvennoJ said:

 Atm it's all that newfangled school math that's stumping us. Math was very different when we were kids.

Side note - that newfangled math is exactly the way I've always done it in my head.  I had problems in school often because I did math in my head, and couldn't write it out and show my work the way the teachers wanted.  Now, they switched it to exactly the same way I wasn't allowed to do it when I was in school.  

With that said, I do not think that the new style is better than the old ways.  It happened to work well for me because I did it in my head.  But, it seems unnecessarily difficult to write it out the new way.  I guess most math is real life is done in one's head though.....