This group activity will encourage you to share calculation
strategies and to think about which strategy might be the most
Can you each work out the number on your card? What do you notice?
How could you sort the cards?
How would you count the number of fingers in these pictures?
What can you say about the angles on opposite vertices of any
cyclic quadrilateral? Working on the building blocks will give you
insights that may help you to explain what is special about them.
A cinema has 100 seats. Show how it is possible to sell exactly 100
tickets and take exactly £100 if the prices are £10 for
adults, 50p for pensioners and 10p for children.
Take any four digit number. Move the first digit to the 'back of
the queue' and move the rest along. Now add your two numbers. What
properties do your answers always have?
Marcus, Kathryn, Philippa and Ellie all used fantastic proportional
reasoning as they worked on this problem.
Go to last month's problems to see more solutions.
Members of the NRICH team are beginning to write blogs and this very short article is designed to put the reasoning behind this move in context.
NRICH website full of rich tasks and guidance. We want teachers to
use what we have to offer having a real sense of what we mean by
rich tasks and what that might imply about classroom practice.