Exploring and noticing

There are 412 NRICH Mathematical resources connected to Exploring and noticing
Stop the Clock
problem
Favourite

Stop the clock

Age
5 to 7
Challenge level
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This is a game for two players. Can you find out how to be the first to get to 12 o'clock?

Keep it simple
problem
Favourite

Keep it simple

Age
11 to 14
Challenge level
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Can all unit fractions be written as the sum of two unit fractions?
Next size up
problem
Favourite

Next size up

Age
7 to 11
Challenge level
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The challenge for you is to make a string of six (or more!) graded cubes.

Pairs of Numbers
problem
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Pairs of numbers

Age
5 to 7
Challenge level
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If you have ten counters numbered 1 to 10, how many can you put into pairs that add to 10? Which ones do you have to leave out? Why?
Factors and Multiples Game
game
Favourite

Factors and multiples game

A game in which players take it in turns to choose a number. Can you block your opponent?

I'm Eight
problem
Favourite

I'm eight

Age
5 to 11
Challenge level
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Find a great variety of ways of asking questions which make 8.
Two flowers with the numbers 15 and 16 on them
problem
Favourite

Butterfly flowers

Age
5 to 7
Challenge level
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Can you find two butterflies to go on each flower so that the numbers on each pair of butterflies adds to the number on their flower?

Plus Minus
problem
Favourite

Plus minus

Age
14 to 16
Challenge level
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Can you explain the surprising results Jo found when she calculated the difference between square numbers?
The Moons of Vuvv
problem
Favourite

The moons of vuvv

Age
7 to 11
Challenge level
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The planet of Vuvv has seven moons. Can you work out how long it is between each super-eclipse?
Cycling Squares
problem
Favourite

Cycling squares

Age
7 to 11
Challenge level
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Can you make a cycle of pairs that add to make a square number using all the numbers in the box below, once and once only?