
Percentages
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problemIf the base of a rectangle is increased by 10% and the area is unchanged, by what percentage is the width decreased by ?
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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.
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problemFavourite
Would you rather?
Would you rather: Have 10% of £5 or 75% of 80p? Be given 60% of 2 pizzas or 26% of 5 pizzas?
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problem
Retiring to paradise
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? -
problemFavourite
Planning a school trip
You are organising a school trip and you need to write a letter to parents to let them know about the day. Use the cards to gather all the information you need.
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problemFavourite
Doughnut percents
A task involving the equivalence between fractions, percentages and decimals which depends on members of the group noticing the needs of others and responding.
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problem
Better spelling
Weekly Problem 12 - 2010
Can Emily increase her average test score to more than $80$%? Find out how many more tests she must take to do so. -
problem
Slightly outnumbered
If this class contains between $45$% and $50$% girls, what is the smallest possible number of girls in the class? -
problemFavourite
The legacy
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?
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problem
Margins
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?