# Resources tagged with: Rational and irrational numbers

Filter by: Content type:
Age range:
Challenge level:

There are 10 NRICH Mathematical resources connected to Rational and irrational numbers, you may find related items under The Number System and Place Value.

Broad Topics > The Number System and Place Value > Rational and irrational numbers

### Repetitiously

##### Age 14 to 16Challenge Level

Can you express every recurring decimal as a fraction?

### An Introduction to Irrational Numbers

##### Age 14 to 18

Tim Rowland introduces irrational numbers

### The Square Hole

##### Age 14 to 16Challenge Level

If the yellow equilateral triangle is taken as the unit for area, what size is the hole ?

### Equal Equilateral Triangles

##### Age 14 to 16Challenge Level

Can you make a regular hexagon from yellow triangles the same size as a regular hexagon made from green triangles ?

### What Are Numbers?

##### Age 7 to 18

Ranging from kindergarten mathematics to the fringe of research this informal article paints the big picture of number in a non technical way suitable for primary teachers and older students.

### An Introduction to Proof by Contradiction

##### Age 14 to 18

An introduction to proof by contradiction, a powerful method of mathematical proof.

### The Dangerous Ratio

##### Age 11 to 14

This article for pupils and teachers looks at a number that even the great mathematician, Pythagoras, found terrifying.