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Find the digit that makes _ 3520 by 9
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Find the digit that makes _ 3520 by 9

User Michael Lawton
by
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1 Answer

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Remember the divisibility rule for 9. The sum of the digits of the number must be divisible by nine.
Let the digit be
x. Then
x+3+5+2+0=x+10 has to be divisible by nine. Recalling that
18=9*2, we note that
x=8.
User Alyn
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