Easy way to ADD and SUBTRACT Fractions

Use VERTICALLY AND CROSSWISE
to write the answer straight down!




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 number together.
So:




Subtracting is just as easy: multiply
crosswise as before, but the subtract:



Try a few: