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# Percentages, Fractions, and Decimal Values

## Percentages are defined as a fraction or portion of a whole. Generally percentages deal with an amount out of one hundred but can be used in sales, economics, and science. If you've walked into any store you're sure to find something marked a certain percent off. Fractions are not whole numbers with a numerator over a denominator. Usually the numerator and denominator are expressed as integers. There are four types of fractions: simple fractions, complex fractions, mixed fractions, and improper fractions. Decimals are also not integers. They are expressed often like 0.34 and are often rounded off since some go for too long. Both decimals and fractions are also used to convert to percentages.

### What is the percent error formula? Percent Error is the difference between the true value and the estimate divided by the true value and the result is multiplied by 100 to make it a percentage. The percent error obviously can be positive or negative; however, some prefer taking the absolute value of the difference. The formula is the absolute value of the experimental value (minus) the theoretical value divided by theoretical value times 100. % error = (|Your Result - Accepted Value| / Accepted Value) x 100

### What is 20 percent of twelve thousand one hundred dollars? I never saw much point in giving the answer to a mathematical question if the person didn't explain how to get to that answer. With calculators today many mathematical equations are easy to figure, but I am a strong believer in the person understanding the formula and how it works, not just typing numbers into a calculator and magically getting an answer. The question is what is 20% of \$12,100. First we must change the percentage to a decimal, this is easily done by moving the decimal place to spaces to the left (the % represents the decimal). Therefore it gives us .20 Then simply multiply \$12,100 x .20 12,100 x .20 = 2,420 Since we know we are dealing in dollars the answer is \$2,420

### What is 25 percent of 80.00? The easiest and simplest way to calculate a percentage of any number is to remember that 10% of any number, is the number itself with the decimal point one place to the left. I.e 10% of 1478 is 147.8 (The decimal one place to the left) 10% of 100,000,000 is 10,000,000. That means that 10% of 80.00 is 8.000 (keeping the insignificant digits). So 20% would be \$16.00. But we need 5 percent more, so we just split our 10% in half. Half of 8 is 4. So 25% of 80.00 is 16 + 4 which is 20.

### What is the fraction 8 over 25 as a percent? To convert a fraction (or decimal) to percentage, multiply by 100, thus: 8/25 = 8/25 x 100% = 32%

### What 5 percent of 300 million? 0.05x 300,000,000=15000000 0.05 because 5% in decimal form is 0.05, 100% is 1.00 etc, if it is in tens or less it adds a zero for each category(100's,10's,1's,0.1's etc) so since 5 is a one (0-9) it has two zeros past the decimal point.

### What is 30 percent of 80 dollars? "30 percent of 80 dollars" is expressed as "30% times 80 dollars". Then: 0.3 * \$80 = \$24

### What is 2.5 percent of 80000? 2000. You can determine this by multiplying 80,000 by .025 using a calculator, or if doing it by hand, divide 80,000 by 100 to get 800, and multiply by 2.5 to get 2000.....

### What is a decimal of 140 percent? The percent sign % can be defined as "divide by 100". So the decimal of 140% would be 140/100 or 1.4 So if you wanted to know what 140% of any number was you could multiply by 1.4 i.e. 140% of 50 is 50 x 1.4 = 70, or since multiplication is distributive you could also do this (140 x 50)/100 which will also give you 70 1.4

### How do you do recurring decimals to a percentage? Multiplying decimals by 100 will convert them to percentages. If you wish to remove the recurring decimal, convert it to a fraction by putting the recurring digit(s) as the numerator over a denominator of the same number of 9s and reducing the fraction to its lowest terms. Examples 0.333333333... To a percentage: 0.333333333... x 100 = 33.3333333...% 0.3333333... as a fraction: repeating digit is 3 so put as the numerator over a denominator of one 9 to give the fraction 3/9 = 1/3 So 0.333333333... = 33 1/3 % 0.1428571428... To a percentage: 0.1428571428... x 100 = 14.28571428...% 0.28571428... as a fraction: repeating digits are 285714 of which there are six, so put as numerator over a denominator of six 9s to give the fraction 285714/999999 = 2/7 So 0.1428571428... = 14 2/7 %

### Find 90 percent of 40? To find 90% of 40, just multiply .90 times 40, which equals 36. Since 10% of 40 is 4, then 90% of 40 are 4*9=36.

### What is 2.997 round 1 decimal place? Note that: 9 is in the first decimal place Next to that is another 9. Since "another" 9 is at least 5, round up the value to obtain 3.0.

### What is ten percent of five thousand dollars? "Ten percent of five thousands dollars" is interpreted as "10% * \$5000" Then, 0.1 * \$5000 = \$500

### How many ppm in one percent? 10,000 ppm Solution Method: 1. A ppm = 1/1,000,000 = 0.000001 2. What you want to know is: how many ppm would = 1% 3. p * .000001 = .01 4. p = .01 / .000001 5. p = 10,000 You could also do it this way: 1. 1% of 1,000,000 = ppm = 10,000 ppm (but that method lacks a clear path to understanding). === previous answer's method: 1%=1/100=1000000/100=10000ppm.

### How do you increase 80 by 40 percent? ### What is 4 percent of 35000? To find 4 percent of a number, multiply the number by 0.04. In this instance, 0.04 x 35000 = 1400. Therefore, 4 percent of 35000 equals 1400.

### How do you calculate percentage of budget spent? 1: Divide the amount spent by the amount budget: for example: 100\$ spent / 200\$ budgeted = .5 2: .5 is a decimal value. To convert a decimal value to a percentage you must multiple it by 100 and put a "%" or "percent" after it as follows: .5 * 100 = 50% or 50 percent

### Convert decimal number 840 to hexadecimal number? 162 = 256; 3 x 256 = 768; 840 - 768 = 72; 4 x 16 = 64, 72 - 64 = 8 Hexadecimal equivalent of 840 = 348

### What is 25 percent percent of 35000? 25% of 35000 is same as saying 0.25 * 35000 or ¼ * 35000. Then, evaluate that expression to get 8750

### What is 65 percent of 170? "65 percent of 170" is the same as saying "0.65 * 170". Evaluate that expression to obtain 110.5

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