An instructive clock with removable numerating strips mainly includes a clock having time scales provided on a face thereof to show a time point indicated by hour, minute, and second hands of the clock; and at least one numerating strip in the form of an elongated strip for annularly fitting on the clock. The at least one numerating strip is provided on a front side with time marks corresponding to the time scales provided on the clock, and at two ends with corresponding female and male connectors that could be fitly engaged with each other.