Upper and Lower Bounds

Question 1:

Find the lower bound of 40 rounded to 1 s.f.

35

Question 2:

Find the upper bound of 0.42 rounded to 3 d.p.

0.4205

Question 3:

Find the lower bound of 0 rounded to 1 d.p.

-0.05

Question 4:

Find the upper bound of 8.082 rounded to 3 d.p.

8.0825