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### Number and algebra

### Geometry and measure

### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# Post 16 Live Problems and Recent Solutions

### Post 16 Students' Solutions

### What's That Graph?

### Kite in a Square

### Whose Line Graph Is it Anyway?

### Flipping Twisty Matrices

### Square Pair

### Fix Me or Crush Me

### Post 16 Live Problems

Links to the University of Cambridge website
Links to the NRICH website Home page

Nurturing young mathematicians: teacher webinars

30 April (Primary), 1 May (Secondary)

30 April (Primary), 1 May (Secondary)

Or search by topic

Take a look at these recently solved problems.

Age 14 to 18

Challenge Level

Can you work out which processes are represented by the graphs?

Age 14 to 18

Challenge Level

Can you make sense of the three methods to work out what fraction of the total area is shaded?

Age 16 to 18

Challenge Level

Which line graph, equations and physical processes go together?

Age 14 to 18

Challenge Level

Investigate the transformations of the plane given by the 2 by 2 matrices with entries taking all combinations of values 0, -1 and +1.

Age 14 to 18

Challenge Level

Explore the shape of a square after it is transformed by the action of a matrix.

Age 16 to 18

Challenge Level

Can you make matrices which will fix one lucky vector and crush another to zero?

When you visit the NRICH site you may find some activities which are 'live'. This means we are inviting students to send us solutions, and we will publish a selection of them, along with each student's name and their school, a few weeks later. If you'd like to know more about what we're looking for, read this short article.

The last day for sending us solutions to these live problems is Monday 29th April 2024.