In any experimental test there are factors that can contribute to error. For example in a biochemical test if you add the compounds with a faulty pippete then the amount of reagent per sample would vary and that would contribute to a noisy measurement. So by controlling experimental conditions as best as one is able error can be reduced. Never completely eliminated, but managed.
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There isn't one. 7 cannot reduce and 18 can reduce, but not in a factor of 7.
Same as fractions. Check if there is a common factor, then divide both numbers by the common factor.
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You should reduce a fraction if the numerator and denominator have any common factor greater than one.