Question

609,910 tonnes of plastic was recycled. Round this number to 1 significant figure.

Answer 1

Rounding off to one significant figure will be:
600,000

Answer 2

609,910 tonnes round to 1 significant figure is 600,000.

Explanation:

Given : 609,910 tonnes of plastic was recycled.

To find : Round this number to 1 significant figure ?

Solution :

When rounding significant figures the rules of rounding numbers :

Except that non-significant digits to the left of the decimal are replaced with zeros

Now we round the number 609,910 to 1 significant number.

It means the number after 6 round to zero.

So,
`609910\approx 600000`

Therefore, 609,910 tonnes round to 1 significant figure is 600,000.