# Resources tagged with: Rational and irrational numbers

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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. ### All Is Number

##### Age 7 to 14 ### Making Rectangles, Making Squares

##### Age 11 to 14Challenge Level

How many differently shaped rectangles can you build using these equilateral and isosceles triangles? Can you make a square? ### Rationals Between...

##### Age 14 to 16Challenge Level

What fractions can you find between the square roots of 65 and 67?