Find the error intervals for the following truncated numbers

Question 1:

0.02 (1 s.f.)
0.02≤x<0.03

Question 2:

3.943 (3 d.p.)
3.943≤x<3.944

Question 3:

1.6 (1 d.p.)
1.6≤x<1.7

Question 4:

500 (1 s.f.)
500≤x<600