Equivalent fractions, decimals and percentages

There are 20 NRICH Mathematical resources connected to Equivalent fractions, decimals and percentages
Power match
problem
Favourite

Power match

Age
16 to 18
Challenge level
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Can you locate these values on this interactive logarithmic scale?
the greedy algorithm
problem
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The greedy algorithm

Age
11 to 14
Challenge level
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The Egyptians expressed all fractions as the sum of different unit fractions. The Greedy Algorithm might provide us with an efficient way of doing this.
Doughnut percents
problem
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Doughnut percents

Age
7 to 14
Challenge level
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A task involving the equivalence between fractions, percentages and decimals which depends on members of the group noticing the needs of others and responding.
Bryony's Triangle
problem
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Bryony's triangle

Age
7 to 11
Challenge level
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Watch the video to see how to fold a square of paper to create a flower. What fraction of the piece of paper is the small triangle?

Tumbling Down
problem
Favourite

Tumbling down

Age
7 to 11
Challenge level
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Watch this animation. What do you see? Can you explain why this happens?

Almost One
problem
Favourite

Almost one

Age
11 to 14
Challenge level
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Choose some fractions and add them together. Can you get close to 1?
Too Close to Call
problem

Too close to call

Age
11 to 14
Challenge level
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Weekly Problem 24 - 2012
Can you put these very close fractions into order?
Pride of Place
problem

Pride of place

Age
11 to 14
Challenge level
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Two fractions have been placed on a number line. Where should another fraction be placed?
Fraction Lengths
problem

Fraction lengths

Age
7 to 11
Challenge level
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Can you find combinations of strips of paper which equal the length of the black strip? If the length of the black is 1, how could you write the sum of the strips?

Linked Chains
problem

Linked chains

Age
7 to 11
Challenge level
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Can you find ways to make twenty-link chains from these smaller chains? This gives opportunities for different approaches.