Question

What is 7 x 10−6 + 2.1 x 10−5.

Answer 1

From BODMAS,
7 x 10 - 6 + 2.1 x 10 - 5
70 - 6 + 21 - 5
64 + 16
80

Answer 2

80

Explanation:

7 x 10−6 + 2.1 x 10−5.

= 70 - 6 + 21 -5

= 64 + 21 - 5

= 85 - 5

= 80