The squares of any 8 consecutive numbers can be arranged into two sets of four numbers with the same sum. True of false?
The sums of the squares of three related numbers is also a perfect square - can you explain why?
Find the five distinct digits N, R, I, C and H in the following nomogram
Choose four consecutive whole numbers. Multiply the first and last numbers together. Multiply the middle pair together. What do you notice?
Surprising numerical patterns can be explained using algebra and diagrams...
Play around with the Fibonacci sequence and discover some surprising results!
However did we manage before calculators? Is there an efficient way to do a square root if you have to do the work yourself?
If you know the perimeter of a right angled triangle, what can you say about the area?
What would you get if you continued this sequence of fraction sums? 1/2 + 2/1 = 2/3 + 3/2 = 3/4 + 4/3 =
Pick the number of times a week that you eat chocolate. This number must be more than one but less than ten. Multiply this number by 2. Add 5 (for Sunday). Multiply by 50... Can you explain why it. . . .
Given an equilateral triangle inside an isosceles triangle, can you find a relationship between the angles?
The answer is $5x+8y$... What was the question?
Arrange the numbers 1 to 16 into a 4 by 4 array. Choose a number. Cross out the numbers on the same row and column. Repeat this process. Add up you four numbers. Why do they always add up to 34?
Brian swims at twice the speed that a river is flowing, downstream from one moored boat to another and back again, taking 12 minutes altogether. How long would it have taken him in still water?
Think of two whole numbers under 10, and follow the steps. I can work out both your numbers very quickly. How?
Show that if you add 1 to the product of four consecutive numbers the answer is ALWAYS a perfect square.
Create some shapes by combining two or more rectangles. What can you say about the areas and perimeters of the shapes you can make?
First of all, pick the number of times a week that you would like to eat chocolate. Multiply this number by 2...
Make some loops out of regular hexagons. What rules can you discover?
Can you see how to build a harmonic triangle? Can you work out the next two rows?
Think of a number and follow the machine's instructions... I know what your number is! Can you explain how I know?
Write down a three-digit number Change the order of the digits to get a different number Find the difference between the two three digit numbers Follow the rest of the instructions then try. . . .
Where should you start, if you want to finish back where you started?
Account of an investigation which starts from the area of an annulus and leads to the formula for the difference of two squares.
Can you explain what is going on in these puzzling number tricks?
The Number Jumbler can always work out your chosen symbol. Can you work out how?
The heptathlon is an athletics competition consisting of 7 events. Can you make sense of the scoring system in order to advise a heptathlete on the best way to reach her target?
What is special about the difference between squares of numbers adjacent to multiples of three?
Robert noticed some interesting patterns when he highlighted square numbers in a spreadsheet. Can you prove that the patterns will continue?
There are unexpected discoveries to be made about square numbers...
Think of a number and follow my instructions. Tell me your answer, and I'll tell you what you started with! Can you explain how I know?
Think of a number, add one, double it, take away 3, add the number you first thought of, add 7, divide by 3 and take away the number you first thought of. You should now be left with 2. How do I. . . .
Can you figure out how sequences of beach huts are generated?
A task which depends on members of the group noticing the needs of others and responding.
How to build your own magic squares.
If a two digit number has its digits reversed and the smaller of the two numbers is subtracted from the larger, prove the difference can never be prime.
Take a few whole numbers away from a triangle number. If you know the mean of the remaining numbers can you find the triangle number and which numbers were removed?
Can you explain how this card trick works?
Can you convince me of each of the following: If a square number is multiplied by a square number the product is ALWAYS a square number...
Many numbers can be expressed as the difference of two perfect squares. What do you notice about the numbers you CANNOT make?
A job needs three men but in fact six people do it. When it is finished they are all paid the same. How much was paid in total, and much does each man get if the money is shared as Fred suggests?
Find some triples of whole numbers a, b and c such that a^2 + b^2 + c^2 is a multiple of 4. Is it necessarily the case that a, b and c must all be even? If so, can you explain why?
Let S1 = 1 , S2 = 2 + 3, S3 = 4 + 5 + 6 ,........ Calculate S17.
The problem is how did Archimedes calculate the lengths of the sides of the polygons which needed him to be able to calculate square roots?
A mother wants to share a sum of money by giving each of her children in turn a lump sum plus a fraction of the remainder. How can she do this in order to share the money out equally?
32 x 38 = 30 x 40 + 2 x 8; 34 x 36 = 30 x 40 + 4 x 6; 56 x 54 = 50 x 60 + 6 x 4; 73 x 77 = 70 x 80 + 3 x 7 Verify and generalise if possible.
Jo has three numbers which she adds together in pairs. When she does this she has three different totals: 11, 17 and 22 What are the three numbers Jo had to start with?”
The sum of the numbers 4 and 1 [1/3] is the same as the product of 4 and 1 [1/3]; that is to say 4 + 1 [1/3] = 4 � 1 [1/3]. What other numbers have the sum equal to the product and can this be so. . . .
A box has faces with areas 3, 12 and 25 square centimetres. What is the volume of the box?
Can you explain why a sequence of operations always gives you perfect squares?