Adding makes more.
Subtracting makes less.
e.g.
123
+45
168
=== which is more that the two initial numbers.
145
-23
122
=== which is less than the initial number (145).
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Subtracting a fraction is the same as adding its negative.
adding
I learned to always change the denominators before adding or subtracting the numerators. You must always have a common denominator before adding or subtracting.
When adding and/or subtracting, your answer can only show as many decimal places as the measurement having the fewest number in the decimal places.
only when adding and subtracting