Estimate These Calculations

Question 1:

0.0803×0.997

0.08

Question 2:

6.22×67.8

420

Question 3:

0.6163 0.12

6

Question 4:

85.63 0.76

112.5

Question 5:

37.2×36.3 0.44

4000

Question 6:

51.9×8.4 0.76

500