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

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Pedagogy. physics. Problem solving. biology. Rich Tasks. Money. Real world. Mathematical modelling. Learning mathematics. Calculating with percentages.

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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.

### Retiring to Paradise

##### 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?

### 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.

### KS3 Percentages

##### Stage: 3 Challenge Level:

This package is designed around work on percentages which is outlined in the KS3 Mathematics Framework. One NRICH game and one problem have been identified to support the work on percentages in each. . . .

### Trusting the Tabloids

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

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

### 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?

### 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 ?

### Dating Made Easier

##### Stage: 4 Challenge Level:

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

### 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?