Percentages
- Fraction to percentage: Multiply fraction by 100 and put % sign.
- Percentage to Fraction: Divide percentage by 100, reduce fraction to simplest form and remove % sign.
- Decimal to percentage: Move decimal point 2 places to the right and add % sign.
- Percentage to Decimal: Move decimal point 2 places to the left and remove % sign.
- Fraction-Percentage values to remember:
= 50 %,
= 33.33 %,
= 25 %,
= 20 %,
= 16.66 %,
= 14.28 %,
= 12.25 %,
= 11.11 %,
= 10 %,
= 9.09 %,
= 8.33 %,
= 7.69 %,
= 7.14 %,
= 6.66 %,
= 6.25 %,
= 5.88 %,
= 5.55 %,
= 5.25 %,
= 5 %,
= 4 %,
= 2 %,
Examples:
1. 6.25 % of 320 =
= 20
2. 20 % of 630 =
= 126
- Quantity X as percentage of quantity Y =
× 100
- What percentage of a is b =
× 100
- Percentage increase or decrease in a quantity =
|
Actual increase/decrease
|
Original quantity
|
× 100
- What percentage is X more than Y =
× 100
- What percentage is X less than Y =
× 100