In each of the definitions or clues listed below, there are two rhyming words -- and at least one of them is a math term.   The missing word in each of the following pairs is a math term.

Example:   5 o'clock is prime   time .

1.   2000 pounds is one   ton .

2.   A royal prince is a highness   minus .

3.   Rectangle length is the wide   side .

4.   A skillet diameter is a griddle   middle .

5.   Four and nine are a square   pair .

6.   A wrong total is a dumb   sum .

7.   A finger tapper is a digit   fidget .

8.   A college student majoring in mathematics is following a math   path .

9.   A figure with three curved sides is a newfangle   triangle .

10.   Solving a definite integral is integration   calculation .

11.   A woman who can add forty numbers in her head is an addition   magician .

12.   A pair of cows is two   moo .

13.   After winning the championship for the seventh time in a row,
        the coach said, "Next year will be eight   straight ."

14.   When you add 4 pigs to 5 pigs, you get nine   swine .

15.   When Noah painted his boat black, God said it was a dark   arc .

16.   A Ph.D. is a marquee   degree .

17.   There is a fine   line   between genius and insanity.

18.   One astronaut in space is solitude   altitude.

19.   The two delinquent boys were double   trouble.

20.   The magician's concentration was a hokus pokus   focus .

21.   A chuckle is a half   laugh .

22.   A converse is a reverse   inverse .   (well, not really).