Back-of-the-Mask Thinking

When the crisp-and-crude method of calculation, which yields an approximate instead of an exact answer to a problem, is done on a mask rather than on an envelope or a napkin.

With billions of people wearing a face mask to shield themselves against the coronavirus, the back-of-the-mask thinking is a lifelong guesstimation skill math teachers and tutors worldwide ought to promote to students during this pandemic crisis.

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