Answers

2014-07-05T22:14:05+08:00
371 . Because: For example, the number 371: 37 − (2×1) = 37 − 2 = 35; 3 − (2 × 5) = 3 − 10 = −7; thus, since −7 is divisible by 7, 371 is divisible by 7.
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What's the divisibility rule for 7?
2014-07-05T22:29:38+08:00
Divisbility Rule of 7 : 
The last digit is multiplied by 2 and subtracted from the rest of the number. The result is either 0 or divisible by 7.
Ex: 2205 
9751
672
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