Rounding to Significant Figures

Question 1:

Round to 1 s.f. 91.689

90

Question 2:

Round to 3 s.f. 0.0022275

0.00223

Question 3:

Round to 1 s.f. 0.28546

0.3

Question 4:

Round to 1 s.f. 43478

40000

Question 5:

Round to 1 s.f. 42110

40000

Question 6:

Round to 3 s.f. 4.4297

4.43