Other tags that relate to Balancing the Books
Generalising. Creating and manipulating expressions and formulae. Sampling. Maths Supporting SET. Averages. Measures of spread. Handling data. Questioning. Sport. Inequalities.There are 15 results
Broad Topics > Fractions, Decimals, Percentages, Ratio and Proportion > Percentages
Dating Made Easier
Age 14 to 16
Challenge Level
If a sum invested gains 10% each year how long before it has doubled its value?
Doughnut Percents
Age 7 to 14
Challenge Level
A task involving the equivalence between fractions, percentages and decimals which depends on members of the group noticing the needs of others and responding.
Round and Round
Age 14 to 16
Challenge Level
Prove that the shaded area of the semicircle is equal to the area of the inner circle.
The Legacy
Age 14 to 16
Challenge Level
Your school has been left a million pounds in the will of an ex- pupil. What model of investment and spending would you use in order to ensure the best return on the money?
Roasting Old Chestnuts 4
Age 11 to 16
For teachers. Yet more school maths from long ago-interest and percentages.
Matching Fractions, Decimals and Percentages
Age 7 to 14
Challenge Level
Can you match pairs of fractions, decimals and percentages, and beat your previous scores?
Fractions and Percentages Card Game
Age 11 to 16
Challenge Level
Can you find the pairs that represent the same amount of money?
Retiring to Paradise
Age 11 to 14
Challenge Level
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?
Mathland Election
Age 11 to 14
Challenge Level
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.
A Change in Code
Age 14 to 16
Challenge Level
There are two sets of numbers. The second is the result of the first after an increase by a constant percentage. How can you find that percentage if one set of numbers is in code?
Percentage Unchanged
Age 14 to 16 Short
Challenge Level
If the base of a rectangle is increased by 10% and the area is unchanged, by what percentage is the width decreased by ?
Circle Packing
Age 14 to 16
Challenge Level
Equal circles can be arranged so that each circle touches four or six others. What percentage of the plane is covered by circles in each packing pattern? ...
Put Out the Flags
Age 11 to 14
Challenge Level
Tim and Beth both have a string of flags. Use the percentages to find out who has the most flags.
Trusting the Tabloids
Age 11 to 16
Challenge Level
Can you match the cards and figure out whether the tabloid headlines can be trusted?
NRICH is part of the family of activities in the Millennium Mathematics Project.