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2190                                                                  ARITHMETIC

Percent         Decimal             Common Fraction

100%     =      1.0      =       m      =      i

75%      =       .75       =        ^       =        |

50%      =       .50      =        jfo      =       i

25%      =       .25       =        T^       =        i

10%     =      .10      =       Ik      =      &

9%      =       .09       =        Tfa

4%      =       .04       =        i4*      =      A

1%      =       .01       =        ^

i/2%      =       .005     =       n/ta      =     ^

i/4%      =       .0025   =       rt^W     =      Tfo

125%      =       1.25     =        -m      =       U

160%      =       1.60     =        flft      =       If

Finding % of a number is the same as finding 75% of that number.

180-4-% of some number; or 180 = 75% of some number. A good knowledge of fractions makes percentage easy. Express as common fractions in lowest terms: 4%, 33|%, 175%, %%.

4% = T^ = A, ^% =       = *'

Express each of the following as a decimal, and as a common fraction in its lowest terms:

20%                75%             125%              60%                 9%

25%                15 %            37i/2%              i/2%              61/4%

12%                80%            87i/2%         1371/2%            11|%

30%              16|%                %%           62i/2%                24%

We may express a common fraction as a per cent by reducing the common fraction to a decimal and expressing the decimal as hundredths. Express as per cents:   -fa,   fc,   T|^.

.0614                             .58*                                   .008

16JLOO  =61/4%           12JTOO   =58^%            125)1.000      =$%

96                               60                                      1000

~4                              100

96

4 Express decimally as hundredths, and then as per cents:

I,  i>    i>   i>    i>    \>   i>    i'    TO>    A

The following per cents with their fractional equivalents are so fre^ quently used that they should be committed to memory:

6J% = &      20 %= i        40 %= |        70 %=& 8i%=A        25 %= i         50 %= i        75 %= | 10 %=T^       30 %=A        60 %= f        80 %= * 124% = 1        33^% = i         62J% = f        87|% = | 16f% = i        37|% = f        66f% = f        90 % = A