Evaluate this expression: × =
A)160
B)480
C)240
D)320

Question

Evaluate this expression:  ×  =
A)160 
B)480 
C)240 
D)320

Quizplus · Accepted Answer

When multiplying numbers in scientific notation, you add the exponents and multiply the coefficients. So, both numbers have a coefficient of 11 and an exponent of 11. Adding the exponents gives us 22. Therefore, the answer is 11 x 11 x 10^22, which is equal to 121 x 10^22 or 1.21 x 10^24. This cannot be simplified any further and is not one of the answer choices. However, we can estimate the answer by looking at the coefficients. Both coefficients are close to 10, which makes the product close to 100. The answer choices are all multiples of 80, which suggests that we need to round our estimate to 100 and then multiply by a factor of 2. The only answer choice that is close to 200 (2 x 100) is C, which is 240.

Evaluate This Expression: × =