0.42857
by using decimals
686.88 rounded to 3 significant digits is 687
1.239 rounded to 3 significant digits is 1.24
It is: 2.360
It is 4730.
2.56
5.60
Rounded to the nearest tenth, there can be only one decimal. And that is 7.8
2.641, 2.642, 2.643, 2.644
100 (rounded up to the nearest 200).
There are five significant digits.
It is 1570000 rounded to 3 significant figures