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Teacher - show your class the easy way to add and subtract fractions.
Use VERTICALLY AND CROSSWISE to write the answer straight down!
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Multiply crosswise and add to get the top of the answer:
2 x 5 = 10 and 1 x 3 = 3. Then 10 + 3 = 13.
The bottom of the fraction is just 3 x 5 = 15.
You multiply the bottom numbers together.
So: 
Subtracting is just as easy: multiply crosswise as before, but then subtract:
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... nature is the
realisation of the
simplest conceivable
mathematical ideas
realisation of the
simplest conceivable
mathematical ideas
EINSTEIN
