A perfect list of things to do or remember: 10

A perfect score to pass any test: 10 out of 10.

A perfect feeling of pain or well-being: 10

A perfect measure for a decade of years: 10

A perfect number of fingers and toes: 10

A perfect base for counting to 100: 10

A perfect first double-digit birthday: 10

A perfect system for decimals: 10

Ten