Factors and multiples

problem
Sorting numbers

Age

5 to 7

Challenge level

Can you sort numbers into sets? Can you give each set a name?
problem
Three spinners

Age

7 to 11

Challenge level

These red, yellow and blue spinners were each spun 45 times in total. Can you work out which numbers are on each spinner?
problem
One of thirty-six

Age

5 to 7

Challenge level

Can you find the chosen number from the grid using the clues?
problem
What do you need?

Age

7 to 11

Challenge level

Four of these clues are needed to find the chosen number on this grid and four are true but do nothing to help in finding the number. Can you sort out the clues and find the number?
problem
A first product Sudoku

Age

7 to 14

Challenge level

Given the products of adjacent cells, can you complete this Sudoku?
problem
Flow chart

Age

11 to 14

Challenge level

The flow chart requires two numbers, M and N. Select several values for M and try to establish what the flow chart does.
problem
Expanding zeros

Age

11 to 14

Challenge level

Weekly Problem 22 - 2008
The following sequence continues indefinitely... Which of these integers is a multiple of 81?
problem
Nine in a line

Age

11 to 14

Challenge level

The sum of 9 consecutive positive whole numbers is 2007. What is the largest of these numbers?
problem
Growing garlic

Age

5 to 11

Challenge level

Ben and his mum are planting garlic. Can you find out how many cloves of garlic they might have had?
problem
Factor-multiple chains

Age

7 to 11

Challenge level

Can you see how these factor-multiple chains work? Find the chain which contains the smallest possible numbers. How about the largest possible numbers?