Percentages
Converting
Converting percentages to fractions - the number over 100
Converting percentages to decimals - divide by 100
Converting decimals to percentages - multiply by 100
Quick Percentages
Percentage | Decimal | Fraction |
1% | 0.01 | 1/100 |
2% | 0.02 | 2/100 |
3% | 0.03 | 3/100 |
5% | 0.05 | 5/100 |
10% | 0.1 | 10/100 |
20% | 0.2 | 20/100 |
50% | 0.5 | 50/100 |
75% | 0.75 | 75/100 |
90% | 0.9 | 90/100 |
100% | 1.0 | 100/100 |
Calculating Percentage Increase
A = Amount Afterwards | B = Amount Before | P = Percentage Change |
A = B * (1 + P) | B = A / (1 + P) | P = (A - B) / B |
salary is B increased by P% | salary is increased by P% to A | salary was B is now A (A > B) |
P% more than B | | B increased to A |
B plus P% | | |
Calculating Percentage Decrease
A = Amount Afterwards | B = Amount Before | P = Percentage Change |
A = B * (1 - P) | B = A / (1 - P) | P = (B - A) / B |
salary is B decreased by P% | salary is decreased by P% to A | salary was B is now A (B > A) |
P% less than B | | B decreased to A |
B minus P% | | |
Compound Percentages - Increase
This is when there are two percentage increases
Compound Percentages - Decrease
This is when there are two percentage decreases
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