Upper and Lower Bounds

Question 1:

Find the upper bound of 6.23 rounded to 2 d.p.

6.235

Question 2:

Find the upper bound of 70 rounded to 1 s.f.

75

Question 3:

Find the upper bound of 74.9 rounded to 3 s.f.

74.95

Question 4:

Find the lower bound of 89 rounded to 2 s.f.

88.5