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### Number and algebra

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### Working mathematically

### For younger learners

### Advanced mathematics

# Secondary Students' Solutions

### Tilted Squares

### Add to 200

### Cyclic Quadrilaterals

### Factors and Multiples Puzzle

### Shapely Pairs

### Product Sudoku

### Surprising Transformations

### What's That Graph?

### Kite in a Square

### Whose Line Graph Is it Anyway?

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Take a look at these recently solved problems.

Age 11 to 14

Challenge Level

It's easy to work out the areas of most squares that we meet, but what if they were tilted?

Age 11 to 14

Challenge Level

By selecting digits for an addition grid, what targets can you make?

Age 11 to 16

Challenge Level

Draw some quadrilaterals on a 9-point circle and work out the angles. Is there a theorem?

Age 11 to 14

Challenge Level

Using your knowledge of the properties of numbers, can you fill all the squares on the board?

Age 11 to 14

Challenge Level

A game in which players take it in turns to turn up two cards. If they can draw a triangle which satisfies both properties they win the pair of cards. And a few challenging questions to follow...

Age 11 to 16

Challenge Level

The clues for this Sudoku are the product of the numbers in adjacent squares.

Age 14 to 16

Challenge Level

I took the graph y=4x+7 and performed four transformations. Can you find the order in which I could have carried out the transformations?

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?