### There are 19 results

Broad Topics >

Calculations and Numerical Methods > Estimating and approximating

##### Age 11 to 14 Challenge Level:

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

##### Age 7 to 14 Challenge Level:

There are nasty versions of this dice game but we'll start with the nice ones...

##### Age 7 to 14 Challenge Level:

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

##### Age 7 to 14 Challenge Level:

Here is a chance to play a version of the classic Countdown Game.

##### Age 14 to 16 Challenge Level:

Practise your skills of proportional reasoning with this interactive haemocytometer.

##### Age 7 to 14 Challenge Level:

How might you use mathematics to improve your chances of guessing the number of sweets in a jar?

##### Age 14 to 16 Challenge Level:

How many generations would link an evolutionist to a very distant
ancestor?

##### Age 11 to 14 Challenge Level:

Can you work out how many of each kind of pencil this student
bought?

##### Age 14 to 16 Challenge Level:

Are these estimates of physical quantities accurate?

##### Age 14 to 18 Challenge Level:

Estimate these curious quantities sufficiently accurately that you can rank them in order of size

##### Age 14 to 16 Challenge Level:

In this twist on the well-known Countdown numbers game, use your knowledge of Powers and Roots to make a target.

##### Age 11 to 14 Challenge Level:

Bluey-green, white and transparent squares with a few odd bits of
shapes around the perimeter. But, how many squares are there of
each type in the complete circle? Study the picture and make. . . .

##### Age 14 to 16 Challenge Level:

10 graphs of experimental data are given. Can you use a spreadsheet to find algebraic graphs which match them closely, and thus discover the formulae most likely to govern the underlying processes?

##### Age 14 to 16 Challenge Level:

Work with numbers big and small to estimate and calulate various quantities in biological contexts.

##### Age 11 to 16 Challenge Level:

From the information you are asked to work out where the picture
was taken. Is there too much information? How accurate can your
answer be?

##### Age 14 to 16 Challenge Level:

Work out the numerical values for these physical quantities.

##### Age 11 to 14 Challenge Level:

Examine these estimates. Do they sound about right?

##### Age 14 to 16 Challenge Level:

Analyse these beautiful biological images and attempt to rank them in size order.

##### Age 14 to 16 Challenge Level:

Get some practice using big and small numbers in chemistry.