Upper and Lower Bounds

Question 1:

Find the lower bound of 3000 rounded to 1 s.f.

2500

Question 2:

Find the lower bound of 890 rounded to 2 s.f.

885

Question 3:

Find the upper bound of 85 rounded to 2 s.f.

85.5

Question 4:

Find the lower bound of 1600 rounded to 2 s.f.

1550