Estimating and approximating

problem

The Magic Number and the Hepta-Tree

Age

7 to 11

Challenge level

Find the exact difference between the largest ball and the smallest ball on the Hepta Tree and then use this to work out the MAGIC NUMBER!
game

Nice or Nasty for Two

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.
problem

A Jar of Teddies

Age

7 to 14

Challenge level

How many teddies are in the jar? How many teddies could you fit in your classroom?
problem

Whole Numbers Only

Age

11 to 14

Challenge level

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

Where Am I?

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?
problem

More or Less?

Age

14 to 16

Challenge level

Are these estimates of physical quantities accurate?
problem

Time to Evolve

Age

14 to 16

Challenge level

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

Big and Small Numbers in Physics

Age

14 to 16

Challenge level

Work out the numerical values for these physical quantities.
problem

Does This Sound About Right?

Age

14 to 16

Challenge level

Examine these estimates. Do they sound about right?
problem

Big and Small Numbers in Biology

Age

14 to 16

Challenge level

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