It has 1 significant figure.
4252 to 1 significant figure is 4000.
1150 to 1 significant figure is 1000
0.019 to 1 significant figure is 0.02 (significant figure is counted from the left with 1st significant being the first non-zero from the left)
0.004 has 1 significant figure.
37.753 rounded to one significant figure becomes 40
It has 1 significant figure.
4252 to 1 significant figure is 4000.
4916 to 1 significant figure is 5000
Rounded to 1 significant figure it is 0.4
1150 to 1 significant figure is 1000
654 rounded to one significant figure becomes 700.
1534 to 1 significant figure is 2000.
1512 to 1 significant figure is 2000
0.00009893 to 1 significant figure = 0.0001
6694 rounded to 1 significant figure is 7000
10920 to 1 significant figure is 10000