Upper and Lower Bounds

Question 1:

Find the lower bound of 10000 rounded to 1 s.f.

9500

Question 2:

Find the upper bound of 8.64 rounded to 2 d.p.

8.645

Question 3:

Find the upper bound of 3000 rounded to 1 s.f.

3500

Question 4:

Find the upper bound of 4.018 rounded to 3 d.p.

4.0185