14
Jan
09

january 14 – Math Olympiad test

olympiad

Each week Another parent and I work with 4th – 6th grade students and Math Olympiad problems. This week they had a test.

The most challenging problem involved finding the ones digit of a number with 50 factors of 7.  Students were expected to see a pattern:

7 x 7 = 49

7 x 7 x 7 = ??3

7 x 7 x 7 x 7 = ???1

7 x 7 x 7 x 7 x 7 = ???7

7 x 7 x 7 x 7 x 7 x 7 = ????9

The ones digit pattern= 9,3,1,7,9,3,1,7,9…

I don’t think anyone figured it out.

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