Page 724 - Basic College Mathematics with Early Integers

TABLE ON FINDING COMMON PERCENTS
A.5 OF A NUMBER

Common Percent Shortcut Method
Equivalences* for Finding Percent Example
1
1% = 0.01 Aor 100 B To find 1% of a number, multiply by 1% of 210 is 2.10 or 2.1.
´
0.01.To do so, move the decimal 1% of 1500 is 15.
point 2 places to the left. 1% of 8.6 is 0.086.
1
10% = 0.1 Aor B To find 10% of a number, multiply by 10% of 140 is 14.
10
´
0.1, or move the decimal point of the 10% of 30 is 3.
number one place to the left. 10% of 17.6 is 1.76.
1 1 20
25% = 4 To find 25% of a number, find of the 25% of 20 is 4 or 5.
4
number, or divide the number by 4. 25% of 8 is 2.
1
25% of 10 is 10 4 or 2 .
2
1 1 64
50% = 2 To find 50% of a number, find of the 50% of 64 is 2 or 32.
2
number, or divide the number by 2. 50% of 1000 is 500.
1
9
50% of 9 is or 4 .
2
2
100% = 1 To find 100% of a number, multiply the 100% of 98 is 98.
number by 1. In other words, 100% of a 100% of 1407 is 1407.
number is the number. 100% of 18.4 is 18.4.
#
200% = 2 To find 200% of a number, multiply the 200% of 31 is 31 2 or 62.
number by 2. 200% of 750 is 1500.
200% of 6.5 is 13.
*See Appendix A.4.

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