Imagine you are subtracting in real life. If you have eight apples, but then you eat three of them, you only have five left. Therefore, 8 - 3 = 5.
However, if you have three apples, and take away eight, you have -5 apples. Which is impossible.
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4/9 - 6/36
OVER 9000!
Subtracting two positive fractional numbers, or adding one positive and one negative integer.
if the signs are the same you must add its opposite.
45 /9+72 /-8 /3*4-4*6