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Mathematics 8 Online
OpenStudy (anonymous):

if u and t are the units digits and the tens digits of the product 123456789 x 987654321, what is u - t?

OpenStudy (anonymous):

the answer is 3, but how to do it?

OpenStudy (klimenkov):

Try to multiply 2 numbers: (... +10a+b)(...+10c+d)

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