Exploring and noticing

There are 319 NRICH Mathematical resources connected to Exploring and noticing
How many Rectangles?
problem

How many Rectangles?

Age
11 to 14
Challenge level
filled star filled star empty star
By drawing 5 horizontal and four vertical lines, one can form 12 rectangles. What is the greatest number of rectangles that can be formed by drawing 15 lines?
Growing Surprises
problem

Growing Surprises

Age
11 to 14
Challenge level
filled star empty star empty star
Can you find the connections between linear and quadratic patterns?
Square Number Surprises
problem

Square Number Surprises

Age
14 to 16
Challenge level
filled star filled star empty star
There are unexpected discoveries to be made about square numbers...
Fibonacci Surprises
problem

Fibonacci Surprises

Age
11 to 14
Challenge level
filled star filled star empty star
Play around with the Fibonacci sequence and discover some surprising results!
Beach Huts
problem

Beach Huts

Age
11 to 14
Challenge level
filled star empty star empty star
Can you figure out how sequences of beach huts are generated?
Difference of Two Squares
problem

Difference of Two Squares

Age
14 to 16
Challenge level
filled star filled star empty star
What is special about the difference between squares of numbers adjacent to multiples of three?
Forwards Add Backwards
problem

Forwards Add Backwards

Age
11 to 14
Challenge level
filled star empty star empty star
What happens when you add a three digit number to its reverse?
Add to 200
problem

Add to 200

Age
11 to 14
Challenge level
filled star empty star empty star
By selecting digits for an addition grid, what targets can you make?
Reasoned Rounding
problem

Reasoned Rounding

Age
7 to 14
Challenge level
filled star empty star empty star
Four strategy dice games to consolidate pupils' understanding of rounding.
Going to the cinema
problem

Going to the cinema

Age
11 to 16
A cinema has 100 seats. Is it possible to fill every seat and take exactly £100?