We can rewrite $\displaystyle 2 \frac{1}{2}$ % as 2.5%. 32 is 2.5% of a number $\displaystyle N$, or, equivalently, 0.025 multiplied by a number $\displaystyle N$ is equal to 32. We can write this as an equation and solve for $\displaystyle N$:

$\displaystyle 0.025 N = 32$

$\displaystyle 0.025 N \div 0.025 = 32 \div 0.025$

$\displaystyle N = 1,280$

Set up the proportion statement and solve for $\displaystyle N$ by cross-multiplying:

$\displaystyle \frac{3,200}{N}= \frac{160}{100}$

$\displaystyle N \cdot 160 = 3,200 \cdot 100 = 320,000$

$\displaystyle N \cdot 160 \div 160 = 320,000\div 160$

$\displaystyle N = 2,000$

Set up the proportion statement and solve for $\displaystyle N$ by cross-multiplying:

$\displaystyle \frac{12}{N } = \frac{\frac{3}{4}}{100}$

$\displaystyle \frac{3}{4} \cdot N = 12 \cdot 100 = 1,200$

$\displaystyle \frac{4}{3} \cdot \frac{3}{4} \cdot N = \frac{4}{3} \cdot 1,200$

$\displaystyle N = \frac{4,800}{3} =1,600$

To covert a percent to a decimal, simply remove the percent sign and divide by 100.

$\displaystyle 64.32\%= \frac{64.32}{100}=0.6432$

Set up an equation that represents this scenario.  The question asks what percent of a number is another number.  Keep in mind, the percent of a number is over 100.  

$\displaystyle \frac{x}{100}(80)= 50$ or $\displaystyle \frac{x}{100}\times \frac{80}{1}=\frac{80x}{100}=50$

We can reduce $\displaystyle \frac{80}{100}$ to $\displaystyle \frac{4}{5}$ by dividing both the numerator and the denominator by $\displaystyle 20$

$\displaystyle \frac{4}{5}x = 50$

Now we want to isolate the x by itself. First we multiply each side by $\displaystyle 5$

$\displaystyle 4x=250$

Then divide each side by $\displaystyle 4$.

$\displaystyle x=\frac{250}{4}= \frac{125}{2}= 0.625 = 62.5\%$

Check:  Does $\displaystyle 62.5\%$ of $\displaystyle 80$ equal $\displaystyle 50$?

$\displaystyle 0.625(80)=50$

The correct answer is:  $\displaystyle 62.5\%$

Add the percentages.

$\displaystyle 3\%+3.5\%+100\%= 106.5\%$

To turn the answer into decimal form, simply divide by 100 or move the decimal place back two units to the left and remove the percentage sign.

The answer is:  $\displaystyle 1.065$

Rewrite $\displaystyle 10\%$ as a fraction.

$\displaystyle 10\%= \frac{1}{10}$

Multiply this value with two.

$\displaystyle \frac{1}{10}\times 2 = \frac{1}{5}$

Add the ones digit.

$\displaystyle 6+0+6 = 12$

The ones digit is two.

Carry over the tens digit since this number is ten or greater.

Add the tens digits with the carryover.

$\displaystyle 0+2+8+(1) = 11$

The hundreds and the tens digit is one.

The answer is: $\displaystyle 112\%$

Six percent is six out of a hundred parts.

$\displaystyle 6\% = \frac{6}{100}$

Multiply this with 30.

$\displaystyle \frac{6}{100}\times 30 = \frac{180}{100} = 1.8$

Rewrite $\displaystyle 10\%$ as a decimal or fraction.

$\displaystyle 10\%=0.1 = \frac{1}{10}$

Multiply either value with $\displaystyle 70$.

$\displaystyle \frac{1}{10} (70) = 7$