There are several methods of working out problems in percentage terms. Become comfortable with each of them. Simply knowing that percent means "per 100" is not enough.

100 percent = one

This allows "100 percent" to be placed into numerators as needed, and into denominators, and can be placed into both at the same time.

× 100 percent =xx÷ 100 percent =xx

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Percent = .01

This allows 'percent' to be replaced by '.01' anywhere, although it might be more accurate to replace the 'percent' with an accompanying "multiply by .01" or "× .01" substitution.

percent =x× .01x

Over time, handwriting has suffered in legibility and in necessity. Handwriting is much faster now, as pens, pencils, styluses, and fingertips have replaced quills and brushes. As a result, the '.' in '.01' can often be missed, creating an error in calculation. If choosing to practice the "write .01 in place of percent" method, be sure to add a zero digit in front of the decimal point. This is of particular recent importance when doctors and nurses communicate to each other regarding patient medications.

Percent = 0.01percent =x× 0.01x

Be sure to maintain good order of operations.

1 ÷percent = 1 ÷ (x× 0.01 )x

After some time spent growing comfortable with the p-word, begin using the p-sign. Just remember that in computer work, the '%' can mean something a whole lot different than 'percent.'

100% = 1× 100% =xx÷ 100% =xx

1% = 0.01

1 ÷% = 1 ÷ (x× 0.01 )x

Percent is a word, but that doesn't mean it is a noun. As an adjective, percent cancels out in ratios, multiplies and divides, and adds as common terms.

5% + 10% = 15%

5 percent cows of 10 percent cows = 0.05 × 0.10 cows

5 percent cows to 10 percent cows = 1/2 cows

Lastly, rewrite percent as "÷ 100."

percent =x/100x

Hopefully this will be of some help.