Question

Express the product of 4.0 x 10^-2 m and 8.1 x 10^2 m using the correct number of significant digits

Answer 1

32 (two significant figures)

Explanation:

We are given these two numbers written in scientific notations and we are to find their product, using the correct number of significant digits:

4.0 x 10^-2m and 8.1 x 10^2 m

Here, the exponents will cancel each other as one is negative and the other one is positive so we will be left with:

4.0 x 8.1 = 32.4

To two significant figures, it will be 32.