Upper and Lower Bounds

Question 1:

Find the lower bound of 900 rounded to 1 s.f.

850

Question 2:

Find the upper bound of 428 rounded to 3 s.f.

428.5

Question 3:

Find the upper bound of 1 rounded to 2 s.f.

1.05

Question 4:

Find the lower bound of 36.4 rounded to 2 d.p.

36.395