Estimating and approximating

There are 59 NRICH Mathematical resources connected to Estimating and approximating
Dicey Operations
game
Favourite

Dicey operations

Who said that adding, subtracting, multiplying and dividing couldn't be fun?

Four Go
problem
Favourite

Four go

Age
7 to 11
Challenge level
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This challenge is a game for two players. Choose two of the numbers to multiply or divide, then mark your answer on the number line. Can you get four in a row?
Equation Attack
problem
Favourite

Equation attack

Age
16 to 18
Challenge level
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The equation a^x + b^x = 1 can be solved algebraically in special cases but in general it can only be solved by numerical methods.
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?
A jar of teddies
problem

A jar of teddies

Age
7 to 14
Challenge level
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How many teddies are in the jar? How many teddies could you fit in your classroom?
Nice or Nasty for Two
game

Nice or nasty for two

Some Games That May Be Nice or Nasty for an adult and child. Use your knowledge of place value to beat your opponent.
Four Go for Two
game

Four go for two

Four Go game for an adult and child. Will you be the first to have four numbers in a row on the number line?
The Fastest Cyclist
problem

The fastest cyclist

Age
14 to 16
Challenge level
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Andy is desperate to reach John o'Groats first. Can you devise a winning race plan?
Branching Processes and Extinction
problem

Branching processes and extinction

Age
16 to 18
Challenge level
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An advanced mathematical exploration supporting our series of articles on population dynamics for advanced students.