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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!

Have You Got It?

Can you explain the strategy for winning this game with any target?

Counting Factors

Is there an efficient way to work out how many factors a large number has?

A First Product Sudoku

Age 11 to 14 Challenge Level:
Rosie and Zoe solved this Sudoku, their journey can be found here. The order with which they filled the Sudoku is marked in the boxes. This is one possible method of many to help you solve the problem.