Percentages

problem

The Magic Number and the Hepta-Tree

Age

7 to 11

Challenge level

2 out of 3

Find the exact difference between the largest ball and the smallest ball on the Hepta Tree and then use this to work out the MAGIC NUMBER!
problem

Put Out the Flags

Age

11 to 14

Challenge level

1 out of 3

Tim and Beth both have a string of flags. Use the percentages to find out who has the most flags.
problem

Better Spelling

Age

11 to 14

Challenge level

1 out of 3

Weekly Problem 12 - 2010
Can Emily increase her average test score to more than $80$%? Find out how many more tests she must take to do so.
problem

Retiring to Paradise

Age

11 to 14

Challenge level

1 out of 3

When Charlie retires, he's looking forward to the quiet life, whereas Alison wants a busy and exciting retirement. Can you advise them on where they should go?
problem

Mathland Election

Age

11 to 14

Challenge level

2 out of 3

A political commentator summed up an election result. Given that there were just four candidates and that the figures quoted were exact find the number of votes polled for each candidate.
problem

Margins

Age

11 to 14

Challenge level

2 out of 3

Weekly Problem 16 - 2008
A 30cm x 40cm page of a book includes a 2cm margin on each side... What percentage of the page is occupied by the margins?
problem

Slightly Outnumbered

Age

11 to 14

Challenge level

3 out of 3

If this class contains between $45$% and $50$% girls, what is the smallest possible number of girls in the class?
problem

Trusting the Tabloids

Age

11 to 16

Challenge level

2 out of 3

Can you match the cards and figure out whether the tabloid headlines can be trusted?
problem

A Change in Code

Age

14 to 16

Challenge level

1 out of 3

Can you find the percentage increase if the results appear in code?
problem

Pied Piper

Age

14 to 16

Challenge level

1 out of 3

How many rats did the Pied Piper catch?