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Diplomatic International School :: Scientific subjects :: Math. Section :: Grade 5
 

 what about 7

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maths coordinator

maths coordinator


Posts : 113
Join date : 2010-01-28
Location : Deplomatic International School

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PostSubject: what about 7   what about 7 I_icon_minitimeSat Feb 13, 2010 7:39 am
Test for Divisibility by 7
- Double the last digit and subtract it from the remaining leading truncated number. If the result is divisible by 7, so will be the number
Example: 4991
Steps:
499 - 2(1) = 497
49 - 2(7) = 35
Since 7|35, the number is divisible by 7

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