# Resources tagged with: Calculators

### There are 8 results

Broad Topics >

Physical and Digital Manipulatives > Calculators

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

If a sum invested gains 10% each year how long before it has
doubled its value?

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

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. . . .

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

Keep constructing triangles in the incircle of the previous triangle. What happens?

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

Which set of numbers that add to 10 have the largest product?

##### Age 5 to 16

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?

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

Investigate what happens if we create number patterns using some simple rules.

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

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?

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

Use the clocks to investigate French decimal time in this problem.
Can you see how this time system worked?