6.21 with one significant figure is just 6
2 significant figures.
The significant figure of 37.753 to 1 significant figure is 40.
It has 1 significant figure.
0.00009893 to 1 significant figure = 0.0001
1512 to 1 significant figure is 2000
4252 to 1 significant figure is 4000.
4916 to 1 significant figure is 5000
Rounded to 1 significant figure it is 0.4
9753261 to 1 significant figure is 10,000,000
1150 to 1 significant figure is 1000
Truncated to one significant figure, it's 9,000 .Rounded to one significant figure, it's 10,000.