A number line is marked in tenths from 0 to 1.
How many of these tenth-marks lie between $\frac{1}{5}$ and $\frac{4}{5}$ (not counting the marks at $\frac{1}{5}$ and $\frac{4}{5}$ )?

Question

A number line is marked in tenths from 0 to 1. How many of these tenth-marks lie between 1/5 and 4/5 (not counting the marks at 1/5 and 4/5)?

Accepted Answer

5. 1/5 = 2/10 and 4/5 = 8/10. The marks strictly between are 3/10, 4/10, 5/10, 6/10, 7/10 — that is 5 marks.

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