Percentages

There are 30 NRICH Mathematical resources connected to Percentages
Are you a Smart Shopper?
problem

Are you a smart shopper?

Age
7 to 11
Challenge level
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In a town there are three supermarkets which each have a special deal on some products. If you bought all your shopping in one shop, which would be the cheapest?

Antiques Roadshow
problem

Antiques roadshow

Age
14 to 16
Challenge level
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Last year, on the television programme Antiques Roadshow... work out the approximate profit.
Circle Packing
problem

Circle packing

Age
14 to 16
Challenge level
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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? ...
Margins
problem

Margins

Age
11 to 14
Challenge level
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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?
Round and Round
problem

Round and round

Age
14 to 16
Challenge level
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Prove that the shaded area of the semicircle is equal to the area of the inner circle.
Slightly Outnumbered
problem

Slightly outnumbered

Age
11 to 14
Challenge level
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If this class contains between $45$% and $50$% girls, what is the smallest possible number of girls in the class?
Trusting the Tabloids
problem

Trusting the tabloids

Age
11 to 16
Challenge level
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Can you match the cards and figure out whether the tabloid headlines can be trusted?
Placeholder: several colourful numbers
problem

Pineapple juice

Age
14 to 16
Challenge level
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What percentage of this orange drink is juice?
Activities on the Gattegno Chart
article

Activities on the gattegno chart

In this article, Alf outlines six activities using the Gattegno chart, which help to develop understanding of place value, multiplication and division.