Upper and Lower Bounds

Question 1:

Find the upper bound of 900 rounded to 1 s.f.

950

Question 2:

Find the lower bound of 0.39 rounded to 2 d.p.

0.385

Question 3:

Find the upper bound of 3.818 rounded to 3 d.p.

3.8185

Question 4:

Find the lower bound of 7.6 rounded to 1 d.p.

7.55