# Resources tagged with: Calculators

### There are 5 results

Broad Topics >

Physical and Digital Manipulatives > Calculators

##### Age 16 to 18 Challenge Level:

Predict future weather using the probability that tomorrow is wet
given today is wet and the probability that tomorrow is wet given
that today is dry.

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

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

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

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

##### Age 16 to 18 Challenge Level:

$2\wedge 3\wedge 4$ could be $(2^3)^4$ or $2^{(3^4)}$. Does it make any difference? For both definitions, which is bigger: $r\wedge r\wedge r\wedge r\dots$ where the powers of $r$ go on for ever, or. . . .

##### 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?