It seems like it's testing two very different things. If you choose the third or fourth answer it means you don't understand fractions at all. If you choose a

It seems like it's testing two very different things. If you choose the third or fourth answer it means you don't understand fractions at all. If you choose answer one it means that you either tried to do the exact calculation and made a mistake or else that you don't have much experience with approximate arithmetic, which really shouldn't be surprising since very little emphasis is placed on that in school.