SOME CRYPT ARITHMETIC HINTS

SOME CRYPT ARITHMETIC HINTS

1)     READ THE PROBLEM! THEY MAY NOT BE ASKING FOR ALL THE LETTERS, OR ONLY SOME NUMBERS ARE ALLOWED.

2)     IN THIS SITUATION

 XXX

+XXX

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NXXX N=1 (The number sticking out is 1)

3)If F + 1 generates a carry, F=9

4)EVERY LETTER STANDS FOR A DIFFERENT NUMBER, EVERY NUMBER IS A DIFFERENT LETTER. THIS CAN SOMETIMES REDUCE THE NUMBER OF GUESSES YOU NEED TO MAKE, BECAUSE SOME NUMBERS ARE ALREADY "USED."

5) SAME_NUMBER + SAME_NUMBER = 2 X SAME_NUMBER = EVEN_NUMBER. FOR EXAMPLE,9+9=18, YOU WRITE 8, AN EVEN NUMBER, AND CARRY 1.

6) JUMP TO THE LAST COLUMN, BECAUSE THERE ARE NO CARRIES TO WORRY ABOUT.

7) IF YOU GET TO A DEAD END,BACK UP!