with your brain...
Or the old-fashioned way -by counting it out on your fingers.
You multiply the number together - using a calculator if needed.
Using a calculator will make it easier
4 (using a calculator) for example 3*5 [enter]
Two choices: -- Multiply (the number) x (the percent using the percent % key). -- Multiply (the number) x (the percent), then divide the answer by 100. Either way, the claculator displays that many percent of that number.
Multiply by 0.9144
try to find what number times the same numbers equals the number that you have.
If you want it completely accurate:multiply the number by itself (that is two times done)multiply that result by the number (three times done)multiply the last result by the numberrepeat step 4 until the number has been multiplied by itself 100 times (ie repeat step 3 an extra 96 times)If you want an approximation:Take the logarithm of the number (using tables/slide rule/calculator)Multiply the number found in step 1 by 100Find the anti-log of the result of step 2 (using tables/slide rule/calculator)Depending upon the number and your calculator you may get it accurately or just an approximation by using the power button of a calculator, eg 2100 could be [2][xy][1][0][0][=]
Multiply both numbers by five- to get the fraction 85/100... which is 85%
Multiply the whole number times the numerator. Divide the product by the denominator.
Multiply 10.13 by 0.035
480... WITHOUT using a calculator !
4690 without using a calculator !