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There are many benefits to timing your practice, including:
There is a Sticky in this forum " Strategy for picking numbers for Number Properties." You might want to check it out.
It also helps to identify at which points on the number line, the behaviour of the equation changes - Eg between 0 & 1, negative values.
It'll hep narrow down the plug-in choices.
As always, practise more of those Qs on this forum as Himalaya has suggested.