# Search by Topic

#### Resources tagged with Calculating with percentages similar to Roasting Old Chestnuts 4:

Filter by: Content type:
Stage:
Challenge level:

##### Other tags that relate to Roasting Old Chestnuts 4
Money. Problem solving. physics. Rich Tasks. biology. Calculating with percentages. Learning mathematics. Real world. Pedagogy. Mathematical modelling.

### There are 11 results

Broad Topics > Fractions, Decimals, Percentages, Ratio and Proportion > Calculating with percentages

### Roasting Old Chestnuts 4

##### Stage: 3 and 4

For teachers. Yet more school maths from long ago-interest and percentages.

### The Legacy

##### Stage: 4 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?

### Put Out the Flags

##### Stage: 3 Challenge Level:

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

### CD Heaven

##### Stage: 4 Challenge Level:

All CD Heaven stores were given the same number of a popular CD to sell for £24. In their two week sale each store reduces the price of the CD by 25% ... How many CDs did the store sell at. . . .

### Mathland Election

##### Stage: 3 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.

### Trusting the Tabloids

##### Stage: 3 and 4 Challenge Level:

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

##### Stage: 3 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?

### A Change in Code

##### Stage: 4 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?

##### Stage: 4 Challenge Level:

If a sum invested gains 10% each year how long before it has doubled its value?

### Percentage Unchanged

##### Stage: 4 Challenge Level:

If the base of a rectangle is increased by 10% and the area is unchanged, by what percentage (exactly) is the width decreased by ?

### One or Both

##### Stage: 3 Challenge Level:

Problem one was solved by 70% of the pupils. Problem 2 was solved by 60% of them. Every pupil solved at least one of the problems. Nine pupils solved both problems. How many pupils took the exam?