Resources tagged with: Proof Sorting

There are 3 NRICH Mathematical resources connected to Proof Sorting, you may find related items under Thinking Mathematically.

Broad Topics > Thinking Mathematically > Proof Sorting

Iff

Age 14 to 18
Challenge Level

Take a triangular number, multiply it by 8 and add 1. What is special about your answer? Can you prove it?

Kite in a Square

Age 14 to 16
Challenge Level

Can you make sense of the three methods to work out the area of the kite in the square?

Proximity

Age 14 to 16
Challenge Level

We are given a regular icosahedron having three red vertices. Show that it has a vertex that has at least two red neighbours.