Find a six-digit multiple of 64 that consists only of the d

Find a six-digit multiple of 64 that consists only of the d

Postby Mellie » Wed Jul 22, 2015 12:10 pm

Find a six-digit multiple of 64 that consists only of the digits 1 and 2.





Mellie
 
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Re: Find a six-digit multiple of 64 that consists only of th

Postby Guest » Thu Jul 23, 2015 5:55 pm

1908 x 64 = 122112

Use the fact that a number is a multiple of 2 if the last digit is a multiple of 2 to determine the last digit of the 6 digit number.
Use the fact that a number is a multiple of 4 if the last 2 digits together form a multiple of 4 to determine the second last digit of the 6 digit number.
Use the fact that a number is a multiple of 8 if the last 3 digits together form a multiple of 8 to determine the third last digit of the 6 digit number.
etc.

Hope this helped,

R. Baber.

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