A 2 by 3 rectangle contains 8 squares and a 3 by 4 rectangle contains 20 squares. What size rectangle(s) contain(s) exactly 100 squares? Can you find them all?
Many numbers can be expressed as the sum of two or more consecutive integers. For example, 15=7+8 and 10=1+2+3+4. Can you say which numbers can be expressed in this way?
If you have only 40 metres of fencing available, what is the maximum area of land you can fence off?
An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.
Imagine a large cube made from small red cubes being dropped into a pot of yellow paint. How many of the small cubes will have yellow paint on their faces?
A decorator can buy pink paint from two manufacturers. What is the least number he would need of each type in order to produce different shades of pink.
Is it always possible to combine two paints made up in the ratios 1:x and 1:y and turn them into paint made up in the ratio a:b ? Can you find an efficent way of doing this?
Four bags contain a large number of 1s, 3s, 5s and 7s. Pick any ten numbers from the bags above so that their total is 37.
Can you arrange these numbers into 7 subsets, each of three numbers, so that when the numbers in each are added together, they make seven consecutive numbers?
What size square corners should be cut from a square piece of paper to make a box with the largest possible volume?
Can you describe this route to infinity? Where will the arrows take you next?
A spider is sitting in the middle of one of the smallest walls in a room and a fly is resting beside the window. What is the shortest distance the spider would have to crawl to catch the fly?
My two digit number is special because adding the sum of its digits to the product of its digits gives me my original number. What could my number be?
Explore the effect of reflecting in two parallel mirror lines.
If you move the tiles around, can you make squares with different coloured edges?
Five children went into the sweet shop after school. There were choco bars, chews, mini eggs and lollypops, all costing under 50p. Suggest a way in which Nathan could spend all his money.
Different combinations of the weights available allow you to make different totals. Which totals can you make?
Square numbers can be represented as the sum of consecutive odd numbers. What is the sum of 1 + 3 + ..... + 149 + 151 + 153?
A square of area 40 square cms is inscribed in a semicircle. Find the area of the square that could be inscribed in a circle of the same radius.
How many winning lines can you make in a three-dimensional version of noughts and crosses?
A game for 2 or more people, based on the traditional card game Rummy. Players aim to make two `tricks', where each trick has to consist of a picture of a shape, a name that describes that shape, and. . . .
On the graph there are 28 marked points. These points all mark the vertices (corners) of eight hidden squares. Can you find the eight hidden squares?
Do you notice anything about the solutions when you add and/or subtract consecutive negative numbers?
Have a go at creating these images based on circles. What do you notice about the areas of the different sections?
The diagonals of a trapezium divide it into four parts. Can you create a trapezium where three of those parts are equal in area?
Which has the greatest area, a circle or a square inscribed in an isosceles, right angle triangle?
Can you find an efficient method to work out how many handshakes there would be if hundreds of people met?
Can you maximise the area available to a grazing goat?
Explore when it is possible to construct a circle which just touches all four sides of a quadrilateral.
How many different symmetrical shapes can you make by shading triangles or squares?
The area of a square inscribed in a circle with a unit radius is, satisfyingly, 2. What is the area of a regular hexagon inscribed in a circle with a unit radius?
Explore the effect of combining enlargements.
A hexagon, with sides alternately a and b units in length, is inscribed in a circle. How big is the radius of the circle?
Think of two whole numbers under 10, and follow the steps. I can work out both your numbers very quickly. How?
Liam's house has a staircase with 12 steps. He can go down the steps one at a time or two at time. In how many different ways can Liam go down the 12 steps?
Can you work out the dimensions of the three cubes?
If the hypotenuse (base) length is 100cm and if an extra line splits the base into 36cm and 64cm parts, what were the side lengths for the original right-angled triangle?
Start with two numbers and generate a sequence where the next number is the mean of the last two numbers...
What is the same and what is different about these circle questions? What connections can you make?
There are four children in a family, two girls, Kate and Sally, and two boys, Tom and Ben. How old are the children?
A napkin is folded so that a corner coincides with the midpoint of an opposite edge . Investigate the three triangles formed .
Can you find the area of a parallelogram defined by two vectors?
Many numbers can be expressed as the difference of two perfect squares. What do you notice about the numbers you CANNOT make?
Manufacturers need to minimise the amount of material used to make their product. What is the best cross-section for a gutter?
Sissa cleverly asked the King for a reward that sounded quite modest but turned out to be rather large...
Ben passed a third of his counters to Jack, Jack passed a quarter of his counters to Emma and Emma passed a fifth of her counters to Ben. After this they all had the same number of counters.
Can you find six numbers to go in the Daisy from which you can make all the numbers from 1 to a number bigger than 25?
Can all unit fractions be written as the sum of two unit fractions?
Here's a chance to work with large numbers...
The number 2.525252525252.... can be written as a fraction. What is the sum of the denominator and numerator?