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Mathematics 25 Online
OpenStudy (anonymous):

evaluate 2/9 plus 1/6

OpenStudy (anonymous):

Hello! How do you think you might start this question?

OpenStudy (anonymous):

(It's okay if you have no idea!)

OpenStudy (anonymous):

I haven't done this for 4 years and I need some refreshing

OpenStudy (anonymous):

Okay, no problem! To add up fractions, you need to make sure the denominators are the same (that's the bits on the bottom, so 9 and 6 in this case).

OpenStudy (anonymous):

ok so 3 would be the best denominator

OpenStudy (anonymous):

Well, you're on the right lines :) Actually we need a multiple of 6 and 9, rather than a divisor of 6 and 9.

OpenStudy (anonymous):

ok so 18 goes into 6 3x and 2x into 9

OpenStudy (anonymous):

Perfect!

OpenStudy (anonymous):

So now we need to turn 2/9 into ???/18. What do you think that "???" bit might be?

OpenStudy (anonymous):

9-2= 7???

OpenStudy (anonymous):

Um, not quite. Maybe this picture will help:

OpenStudy (anonymous):

Here I've taken a pizza and divided it into 9 slices, then I've coloured 2 slices:|dw:1409569271475:dw|

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