Challenge Level

Watch the video to see how Charlie works out the sum. Can you adapt his method?

Challenge Level

Ben, Jack and Emma passed counters to each other and ended with the same number of counters. How many did they start with?

Challenge Level

How many solutions can you find to this sum? Each of the different letters stands for a different number.

Challenge Level

Can you do a little mathematical detective work to figure out which number has been wiped out?

Challenge Level

Have a go at creating these images based on circles. What do you notice about the areas of the different sections?

Challenge Level

How many intersections do you expect from four straight lines ? Which three lines enclose a triangle with negative co-ordinates for every point ?