Question

What is the result of the expression 2.58×3.1?

a) 7.98
b) 7.518
c) 8.0018
d) 7.998

Answer 1

The correct answer to the multiplication of 2.58 by 3.1 is 7.998, which is option (d). This is obtained by multiplying 258 by 31 and then placing the decimal to account for the original positions of the decimals in 2.58 and 3.1.

Step-by-step explanation:

The result of multiplying 2.58 by 3.1 is found by performing standard multiplication of these two decimal numbers. First, you would multiply 258 by 31, ignoring the decimal places initially, and then reintroduce the decimals in the product.

Here's the step-by-step calculation:

• 2.58 becomes 258 (by moving the decimal two places to the right).
• 3.1 becomes 31 (by moving the decimal one place to the right).
• Multiply 258 by 31 to get 7998.
• Since we moved the decimal a total of three places to do the multiplication, we need to move it three places to the left in our answer.
• The result is 7.998.

Therefore, the correct answer is 7.998, which corresponds to option (d).