Can you go through this maze so that the numbers you pass add to exactly 100?
Take any four digit number. Move the first digit to the end and move the rest along. Now add your two numbers. Did you get a multiple of 11?
A country has decided to have just two different coins. Which totals can be made? Is there a largest total that cannot be made? How do you know?
A visualisation problem in which you search for vectors which sum to zero from a jumble of arrows. Will your eyes be quicker than algebra?
Do you agree with Badger's statements? Is Badger's reasoning 'watertight'? Why or why not?
If you know the sizes of the angles marked with coloured dots in this diagram which angles can you find by calculation?
