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05 – Estimating

We can use significant figures to get an approximate answer to a problem. Look at these examples.

 

Look at the first example and round all the numbers to 1 sf to make ‘easier’ numbers.

 

It changes to:

\frac{200 \times 40}{0.5}

 

Now the division is simpler and is:

\frac{8000}{0.5}

 

which is 16,000


Your turn:

 

Round the 2nd example to 1sf and then calculate an estimate:

Enter your answer here:

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