Estimate These Calculations

Question 1:

0.0819×0.5

0.04

Question 2:

0.0734×0.973

0.07

Question 3:

3.576 0.39

10

Question 4:

1.05 0.11

10

Question 5:

23.7×57.5 0.12

12000

Question 6:

6.47×7.85 0.78

60