To one significant digit, 37.19 is 4x101. Writing it as 40 makes it unclear as to whether you have 1 significant digit or 2.
62 rounded to one significant figure is 60. 57 rounded to one significant figure is 60. 573 rounded to one significant figure is 600. 0.0573 rounded to one significant figure is 0.06. In each of these answers the 6 is the only significant figure.
1000 is written with one significant figure, with only the 1 being a significant figure.
Rounded to one significant figure it becomes 20
Truncated to one significant figure, it's 9,000 .Rounded to one significant figure, it's 10,000.
Rounded to one significant figure it becomes 40
It is 200 rounded to one significant figure
When it's truncated to one significant figure . . . 20When it's rounded to one significant figure . . . . 30
It has 1 significant figure.
1,246 rounded to one significant figure is 1,000
100 is already rounded to one significant figure.
Rounded to one significant figure it becomes 10
5.63 converts to 6 as one significant figure.