Find the error intervals for the following truncated numbers

Question 1:

1.043 (3 d.p.)
1.043≤x<1.044

Question 2:

3.09 (2 d.p.)
3.09≤x<3.10

Question 3:

0.42 (2 s.f.)
0.42≤x<0.43

Question 4:

20000 (1 s.f.)
20000≤x<30000