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
