Kimie and Sebastian were making sticks from interlocking cubes and
lining them up. Can they make their lines the same length? Can they
make any other lines?
Pat counts her sweets in different groups and both times she has
some left over. How many sweets could she have had?
Can you work out the arrangement of the digits in the square so
that the given products are correct? The numbers 1 - 9 may be used
once and once only.
Can you use this information to work out Charlie's house number?
Arrange the four number cards on the grid, according to the rules,
to make a diagonal, vertical or horizontal line.
I throw three dice and get 5, 3 and 2. Add the scores on the three
dice. What do you get? Now multiply the scores. What do you notice?
What is the lowest number which always leaves a remainder of 1 when
divided by each of the numbers from 2 to 10?
Explore patterns based on a rhombus. How can you enlarge the
pattern - or explode it?
What is the remainder when 2^2002 is divided by 7? What happens
with different powers of 2?
A garrison of 600 men has just enough bread ... but, with the news
that the enemy was planning an attack... How many ounces of bread a
day must each man in the garrison be allowed, to hold out 45. . . .
A mathematician goes into a supermarket and buys four items. Using
a calculator she multiplies the cost instead of adding them. How
can her answer be the same as the total at the till?
When the number x 1 x x x is multiplied by 417 this gives the
answer 9 x x x 0 5 7. Find the missing digits, each of which is
represented by an "x" .
Learn how to use advanced pasting techniques to create interactive
Learn how to use increment buttons and scroll bars to create
interactive Excel resources.
Learn how to make a simple table using Excel.
Investigate factors and multiples using this interactive Excel
spreadsheet. Use the increment buttons for experimentation and
This investigation uses Excel to optimise a characteristic of
Prove that the area of a quadrilateral is given by half the product of the lengths of the diagonals multiplied by the sine of the angle between the diagonals.
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
Find b where 3723(base 10) = 123(base b).
A quadrilateral changes shape with the edge lengths constant. Show
the scalar product of the diagonals is constant. If the diagonals
are perpendicular in one position are they always perpendicular?
Show that for natural numbers x and y if x/y > 1 then x/y>(x+1)/(y+1}>1. Hence prove that the product for i=1 to n of [(2i)/(2i-1)] tends to infinity as n tends to infinity.
In this 'mesh' of sine graphs, one of the graphs is the graph of
the sine function. Find the equations of the other graphs to
reproduce the pattern.
This article for teachers describes how number arrays can be a
useful reprentation for many number concepts.
This article for teachers describes how modelling number properties
involving multiplication using an array of objects not only allows
children to represent their thinking with concrete materials, but
it can also assist them in forming useful mental pictures to
support memory and reasoning.