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.
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It is 200 rounded to one significant figure
Rounded to one significant figure it becomes 40
37.753 rounded to one significant figure becomes 40
1,246 rounded to one significant figure is 1,000
100 is already rounded to one significant figure.