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Weekly Challenges Are Here!

11 to 18

Weekly challenges are here for NRICH! To celebrate this event, we've collected a set of 20 essential problems for you to try.

article

Sums of Powers - A Festive Story

14 to 18

A story for students about adding powers of integers - with a festive twist.

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Difficulties With Division

5 to 11

This article for teachers looks at how teachers can use problems from the NRICH site to help them teach division.

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Bipin's Choice

7 to 11

Bipin is in a game show and he has picked a red ball out of 10 balls. He wins a large sum of money, but can you use the information to decided what he should do next?

problem

Worked Example: Counters in Bags

16 to 18

This worked example computes the number of ways we can move counters around in two bags to determine a probability of interest.

problem

How Old?

7 to 11

Cherri, Saxon, Mel and Paul are friends. They are all different ages. Can you find out the age of each friend using the information?

problem

Favourite

American Billions

11 to 14

Play the divisibility game to create numbers in which the first two digits make a number divisible by 2, the first three digits make a number divisible by 3...