Question

Estimate 13.96 x 6.2
A. about 84
B. about 70
C. about 98
D. about 78

Answer 1

Well to estimate you must change the numbers to 1 Significant Figure so 13.96 is 14 and 6.2 is 6 
Now you just multiply them:
14 × 6 = 84    so THE ANSWER is A. about 84