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## 'What Is Ziffle?' printed from http://nrich.maths.org/

Lots of people sent in solutions for this one.

**Becky** from Wheelers
Lane Junior School, Birmingham, England gave one of the best
explanations ...

"I found this quite an easy puzzle because I know my times
tables well. I soon spotted that 56, 28, 63 and 49 were all in the
seven times table and later found out that 105 was. I also noticed
that 100, 18, 65, 9 and 76 were not in the seven times table. I
then worked out that 14 and 70 were".

As **Susannah from**
Headington Junior School, Oxford says, "A ziffle is a multiple of
7".

**Joshua from** Ampthill,
Bedfordshire, **Emma from**
Cambridge and **Matthew**
from Hethersett Old Hall Juniors also sent in correct
solutions.