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Flipping and subtracting


Did you know that the difference of one number with the other we get by writing it backwards is equal to zero Or the a multiple of nine? See some examples:
22 - 22 = 0
51 - 15 = 36 (multiple of 9)
444 - 444 = 0
998 - 899 = 99 (multiple of 9)
1350 - 0531 = 819 (multiple of 9)
654321 - 123456 = 530865 (multiple of 9)