Off the top of my head:
Units in a dozen.
Dozens in a gross.
Months in a year.
Inches in a foot.
Hours in half a day.
Millilitres in a medical drop.
Troy ounces in a troy pound.
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The roman numeral is XXIV
A connection is 13 is a baker's dozen.
Our primitive ancestors using their 10 fingers and 10 toes for counting resulted in the current decimal system which is used everywhere.
Real numbers can be rational or irrational because they both form the number line.
There may be some hidden agenda in this question. Why would 9 not be a real number?