If a sum invested gains 10% each year how long before it has
doubled its value?
Which set of numbers that add to 10 have the largest product?
Investigate what happens if we create number patterns using some simple rules.
Keep constructing triangles in the incircle of the previous triangle. What happens?
Make a set of numbers that use all the digits from 1 to 9, once and
once only. Add them up. The result is divisible by 9. Add each of
the digits in the new number. What is their sum? Now try some. . . .
Use the clocks to investigate French decimal time in this problem.
Can you see how this time system worked?
Nowadays the calculator is very familiar to many of us. What did
people do to save time working out more difficult problems before
the calculator existed?
Where will the point stop after it has turned through 30 000
degrees? I took out my calculator and typed 30 000 ÷ 360. How
did this help?