problem What numbers can we make now? Age 11 to 14 Challenge level Imagine we have four bags containing numbers from a sequence. What numbers can we make now?
problem Three neighbours Age 7 to 14 Challenge level Take three consecutive numbers and add them together. What do you notice?
problem Digit Addition Age 5 to 11 Challenge level Try out this number trick. What happens with different starting numbers? What do you notice?
problem The Number Jumbler Age 7 to 14 Challenge level The Number Jumbler can always work out your chosen symbol. Can you work out how?
problem Fruity Totals Age 7 to 16 Challenge level In this interactivity each fruit has a hidden value. Can you deduce what each one is worth?
problem Triangle transformation Age 7 to 14 Challenge level Start with a triangle. Can you cut it up to make a rectangle?
problem Multiplication arithmagons Age 14 to 16 Challenge level Can you find the values at the vertices when you know the values on the edges of these multiplication arithmagons?
problem Reversals Age 11 to 14 Challenge level Where should you start, if you want to finish back where you started?
problem Unequal Averages Age 11 to 14 Challenge level Play around with sets of five numbers and see what you can discover about different types of average...
problem Wipeout Age 11 to 16 Challenge level Can you do a little mathematical detective work to figure out which number has been wiped out?