Question

ABCD X 9 = DCBA
How to prove

Answer 1

Answer:

9801

Step-by-step explanation:

A=1 otherwise the product would have 5 digits

D=9 beacause A=1

B=0, or 1, otherwise the product would have 5 digits

If B=1, then C=0, otherwise the product would have 5 digits

But 1109*9=9981, which isn't right

So B=0, then 9*D = 9*9 = 81, so 8+9*c ends with a 0 (B=0) . The only choice is C=8

1089*9

= 9801

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