Divisibility of 7 MTE3101

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Divisibility of 7 MTE3101

  1. 1. DIVISIBILITY OF 7
  2. 2. • Divisibility by 7 – Unfortunately, the rule of thumb for 7 is not straightforward and you may prefer long division. – However here is one approach: • Divisibility of n by 7 is unaltered by taking the last digit of n • subtracting its double from the number formed by removing the last digit from n..
  3. 3. Is 3976 divisible by 7? 3976 x2 −12__ We don’t know if 385 is a multiple of 7 or 385 not, so we continue the procedure. 385 x2 ─10__ Since 28 is a multiple of 7, it must be that 28 both 385 and 3976 are multiples of 7.

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