Question

Please, find the answer.

Answer 1

correct each value to a number with one significant figure
so 11.7 --> 10 and 19.1 ---> 20

can you continue?

Answer 2

First calculate the result and correct it to 2 significant figures

Answer 3

How can I get 11.7 to 10, welshfella?

Answer 4

Usually approximation means we do it mentally. If we use a calculator, we might as well get the exact answer.
Also approximation is generally used to check someone's calculation, or the calculator's results.
Here's also what you can do.

Answer 5

11.7×19.1=223.47=223
9.3×5.7=53.01=53
222/53=4.207

Correct it to 2 significant digits