Multiplication and division

problem
Divide it out

Age

7 to 11

Challenge level

What is the lowest number which always leaves a remainder of 1 when divided by each of the numbers from 2 to 10?
problem
Multiplication squares

Age

7 to 11

Challenge level

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.
problem
Penta post

Age

7 to 11

Challenge level

Here are the prices for 1st and 2nd class mail within the UK. You have an unlimited number of each of these stamps. Which stamps would you need to post a parcel weighing 825g?
problem
All the digits

Age

7 to 11

Challenge level

This multiplication uses each of the digits 0 - 9 once and once only. Using the information given, can you replace the stars in the calculation with figures?
problem
Dividing a cake

Age

7 to 11

Challenge level

Annie cut this numbered cake into 3 pieces with 3 cuts so that the numbers on each piece added to the same total. Where were the cuts and what fraction of the whole cake was each piece?
problem
Four goodness' sake

Age

7 to 11

Challenge level

Use 4 four times in a calculation. What answers can you get?
problem
The tomato and the bean

Age

5 to 7

Challenge level

At the beginning of May, Tom put his tomato plant outside. On the same day he sowed a bean in another pot. When will the two be the same height?
problem
A-magical number maze

Age

7 to 11

Challenge level

This magic square has operations written in it, to make it into a maze. Start wherever you like, go through every cell and go out a total of 15!
problem
Mystery matrix

Age

7 to 11

Challenge level

Can you fill in this table square? The numbers 2 -12 were used to generate it with just one number used twice.
problem
Back to school

Age

7 to 11

Challenge level

Mr. Sunshine tells the children they will have 2 hours of homework. After several calculations, Harry says he hasn't got time to do this homework. Can you see where his reasoning is wrong?