### Pebbles

Place four pebbles on the sand in the form of a square. Keep adding as few pebbles as necessary to double the area. How many extra pebbles are added each time?

### Maze 100

Can you go through this maze so that the numbers you pass add to exactly 100?

### Highest and Lowest

Put operations signs between the numbers 3 4 5 6 to make the highest possible number and lowest possible number.

# Sweets in a Box

##### Stage: 2 Challenge Level:

A sweet manufacturer has decided to design some gift boxes for a new kind of sweet.

Each box is to contain $36$ sweets placed in lines in a single layer in a geometric shape without gaps or fillers.

How many different shaped boxes can you design?

The sweets come in $4$ colours, $9$ of each colour.

Arrange the sweets so that no sweets of the same colour are adjacent to (that is 'next to') each other in any direction. In the picture below, none of the squares marked x can have a red sweet in them.

Arrange the sweets in some of the boxes you have drawn.

Now try making boxes of $36$ sweets in $2$, $3$ or $4$ layers.

Can you arrange the sweets, $9$ each of $4$ colours, so that none of the same colour are on top of each other as well as not adjacent to each other in any direction?

See if you can invent a good way of showing your arrangement.

Try different numbers of sweets such as $24$ or $60$ in each box.