Upper and Lower Bounds

Question 1:

Find the upper bound of 2900 rounded to 2 s.f.

2950

Question 2:

Find the upper bound of 80 rounded to 1 s.f.

85

Question 3:

Find the upper bound of 919 rounded to 3 s.f.

919.5

Question 4:

Find the lower bound of 129 rounded to 3 s.f.

128.5