Answer :
Final answer:
To express 12/25 as a percent using mental math, multiply both the numerator and denominator by 4 to get 48/100, which directly translates to 48%.
Explanation:
To use mental math to express 12/25 as a percent, first recognize the need to convert the fraction to have a denominator of 100, as a percent is essentially a fraction with a denominator of 100. To make 25 into 100, you multiply it by 4. Therefore, you must also multiply the numerator, 12, by the same number.
So, 12/25 becomes 48/100 when you multiply both the numerator and the denominator by 4. Now that the fraction is over 100, it is easy to see that 48/100 is the same as 48%. Thus, 12/25 expressed as a percent is 48%.
Another way to think about calculating a percent is to set up equivalent fractions, one of which is a fraction with 100 as the denominator, and cross-multiply. Here, you would set it up as 12/25 = x/100 and solve for x, which would give you the same result: 48%.