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Perpendicular lines

14 to 16

Position the lines so that they are perpendicular to each other. What can you say about the equations of perpendicular lines?

article

Four teachers using NRICH

5 to 11

Vicki Pike was one of four NRICH Teacher Fellows who worked on embedding NRICH materials into their teaching. In this article, she writes about her experiences of working with students at Key Stage two.

problem

Taking a die for a walk

5 to 11

Investigate the numbers that come up on a die as you roll it in the direction of north, south, east and west, without going over the path it's already made.

article

The naked pair in Sudoku

7 to 16

A particular technique for solving Sudoku puzzles, known as "naked pair", is explained in this easy-to-read article.

Placeholder: several colourful numbers

page

Accessibility statement

An accessibility statement for NRICH

problem

Tom's number

7 to 11

Work out Tom's number from the answers he gives his friend. He will only answer 'yes' or 'no'.

problem

An average average speed

14 to 16

My average speed for a journey was 50 mph, my return average speed of 70 mph. Why wasn't my average speed for the round trip 60mph ?

problem

Some secret codes

7 to 11

Can you follow the rule to decode the messages?

problem

Strange bank account (part 2)

11 to 14

Investigate different ways of making £5 at Charlie's bank.

problem

Favourite

Box plot match

14 to 16

Match the cumulative frequency curves with their corresponding box plots.