maths coordinator
Posts : 113 Join date : 2010-01-28 Location : Deplomatic International School
| Subject: new .......new...... the rule of number 7 Sat Feb 13, 2010 7:40 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 Maths coordinator | |
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