12.5 × 24.6 =?

When doing manual multiplication (without the aid of a calculator), multiply 12.5 by 24.6 as if there were no decimals involved. Thus, 125 × 246 = 30750. Count the decimal places in the numbers 12.5 and 24.6 - it’s easy to see that there are 2 decimal places. Going back to the product we initially computed, 30750; move the decimal, which we assume to be at the end of the last digit, 2 places to the left. This gives us the correct answer, 307.5. With the calculator, though, simply press the given numbers and the required math operation sign to arrive at the correct answer.