The ten digits are shown in seven-segment style. How many of them look exactly the same in the dashed mirror?

A digit survives an upright mirror only if it is symmetric left-to-right. Only 0 and 8 are. The 1 has its flag on one side, 3 opens to the left in the mirror, and 2 and 5 swap shapes, so they do not count. (3 or 4 wrongly counts 1, 2 or 5.)