
Changing
a whole number into a percent
a) Write 7 as a percent. Find the invisible decimal. It's behind the
whole number. Move it 2 places to its right and place zeroes in the
two places. Therefore 7 = 700%
b) Write 14 as a percent. Find the invisible decimal. It's behind
the whole number. Move it 3 places to its right and place zeroes in
the two places. Therefore 14 = 1400 %

Changing
a decimal to percent and back to decimal:
a) Write .34 as a percent = 34%  as percent
contains two zeros, move the decimal 2 places to the right, add the
percent sign. Note the decimal point is invisible
b) Write 0.0085 as a percent = 0.85% as percent contains two zeros,
move the decimal 2 places to the right, add the percent sign after
the numbers.
c) Write 3.64 as a percent = 364%  as percent contains two zeros,
move the decimal two places to where the percent sign sits and add
the sign. Note the decimal point is invisible.

Changing
a percent to a decimal:
a) Write 45% as a decimal = .45  as percent
contains two zeros, move the decimal 2 places away from the percent
or to the left  drop the percent sign and add zeros as needed.
a) Write 70.4% as a decimal = .704  as percent contains two zeros,
move the decimal 2 places away from the percent  or to the left 
drop the percent sign and add zeros as needed.

Change a fraction to a decimal or percent and back:
a) Write 4/5 as a percent  first change 4/5
into a decimal read the problem as 4 divided by 5. Write it as a
division problem  there is an invisible decimal after the 4  5 cannot
to go into 4 
Put in the invisible decimal and add a zero – it looks like the
answer is .8
(if you look at rule number 2) is 80%
b) Write 75% as a fraction first convert a decimal 0.75that read
words  seventyfive hundredthsnow why to as a fraction 75 over 100
and be sure to reduce this to 3/4. HINT  count the number of places
after the decimal  replace with an equal number of zeros  now place
a one in front of the zero. Therefore 0.0702 = 702 over 10000 reduced
= 301 over 5000.
