Upper and Lower Bounds

Question 1:

Find the lower bound of 77.8 rounded to 3 s.f.

77.75

Question 2:

Find the upper bound of 2.57 rounded to 2 d.p.

2.575

Question 3:

Find the lower bound of 30 rounded to 1 s.f.

25

Question 4:

Find the upper bound of 0.6 rounded to 1 d.p.

0.65