Estimate These Calculations

Question 1:

0.0506×85.3

4.5

Question 2:

74.7×0.0045

0.35

Question 3:

67.21 0.21

350

Question 4:

28.68 0.49

60

Question 5:

4.09×98.1 0.53

800

Question 6:

5.91×5.16 0.13

300