10
There are 47 ways.
It depends on which country's currency the question is about.
Assuming that you are only using current US coins (5, 10, 25 and 50 cents), the answer is 21. NickelsDimesQuartersHalves1500013100112009300740055003600170010010811062104310241005105020312012205001310112010011
There are 47 ways using 5p, 10p, 20p and 50p.
3
22 ways
51
Three different ways.
120 different ways.
Two ways only: one with a pasta maker. The other using a rolling pin.
9=10
Three: one using only nickels, one using only dimes and one using only quarters!