Cryptarithms - Number Puzzles - Cryptarithms.com

Cryptarithms
Cryptarithms are a type of mathematical puzzle in which the digits are replaced by symbols (typically letters of the alphabet). For example:

9567 + 1085 = 10652

can be represented like this:

abcd + efgb = efcbh

Alphametics
The term alphametic is used when the letters form words and phrases. Here's a famous one:

		S	E	N	D
+		M	O	R	E

	M	O	N	E	Y

Solve

		9	5	6	7
+		1	0	8	5

	1	0	6	5	2

There is also a subset of alphametics called 'doubly-true' where the words are spelt out numbers which also form a valid sum:

	F	O	R	T	Y
			T	E	N
+			T	E	N

	S	I	X	T	Y

Solve

	2	9	7	8	6
			8	5	0
+			8	5	0

	3	1	4	8	6

Try these other examples.

Cryptarithm Rules

Each letter represents a unique digit.
Numbers must not start with a zero.
The solution is unique (unless otherwise stated).

Links to other cryptarithm sites

Jorge Soares's Cryptarithms.
The Contest Center.
Alphametic Puzzle Generator.
Alphametic Puzzle Solver.

Other sites
If you like puzzles, why not try these sites...

Combination Lock
Tile Puzzles
Spot The Difference