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Winning Team

Age 11 to 14
Challenge Level Yellow star
  • Problem
  • Student Solutions

Nine cross country runners compete in a team competition in which there are three matches.

In the first match team X races against team Y, in the second it is team Y against team Z and in the third it is team Z against team X.

The runners are A, B, C, D, E, F, G, H and I and in all the matches, when they run, they finish in this order.

The teams are team X with runners A, F and H; team Y with runners B, D and I; and team Z with runners C, E and G.

In each match all the runners finish the course and 21 points are awarded, 6 points to the first, 5 to the second, 4 to the third and so on.

The judges work out the results of each of the three matches and try to decide on the winning team for the competition overall.

If you were a judge what would you decide and what is peculiar about the mathematics involved in this?


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Adding All Nine

Make a set of numbers that use all the digits from 1 to 9, once and once only. Add them up. The result is divisible by 9. Add each of the digits in the new number. What is their sum? Now try some other possibilities for yourself!

Summing Consecutive Numbers

15 = 7 + 8 and 10 = 1 + 2 + 3 + 4. Can you say which numbers can be expressed as the sum of two or more consecutive integers?

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The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

NRICH is part of the family of activities in the Millennium Mathematics Project.

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