truco:
ab x 99 = ab00 - ab
abc x 999 = abc000 - abc
abc x 999 = ...456
abc000 - abc = ...456
a=5, b=4, c=4
∴ a+b+c = 5+4+4 = 13
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truco:
ab x 99 = ab00 - ab
abc x 999 = abc000 - abc
abc x 999 = ...456
abc000 - abc = ...456
a=5, b=4, c=4
∴ a+b+c = 5+4+4 = 13