Percentages
Because who can remember if it's times or divide?
Soulver includes handy percentage phrases for all scenarios you're likely to run into.

Getting a percentage of a number

10% of 200 | 20
25% × 200 | 50

Adding a percentage to or taking a percentage off a number

200 + 10% | 220
10% on 200 | 220
200 - 10% | 180
10% off 200 | 180O

One number as a percentage of/on/off another number

20 is 10% of what | 200
180 is 10% off what | 200
220 is 10% on what | 200

Getting the change from one number to another, as a percent

50 to 75 is what % | 50%
40 to 90 as % | 125%
180 is what % off 200 | 10%
180 is what % on 150 | 20%
20 is what % of 200 | 10%
20 as a % of 200 | 10%
20/200 as % | 10%
20/200 % | 10%

Calculations with mixed percentages & decimals

You can do calculations with pure percentages:
10% + 20% | 30%
90% − 40% | 50%
And you can add/subtract decimals & fractions to/from percentages. 1.0 is equivalent to 100%.
30% + 0.4 | 70%
100% - 1/2 | 50%
100% + 2 + 30% | 330%
Note that when multiplying a percentage by a number, the answer will always be a number (not a percentage), regardless of order:
50% × 30 | 15
30 × 50% | 15

Fractions and Multipliers

The percentage in any of the aforementioned functions can also be replaced with a fraction:
2/3 of 600 | 400
50 is 1/5 of what | 250
You can also use "x", "multiple" or "multiplier" instead of percentage:
50 as x of 5 | 10x
2 as multiplier of 1 | 2x
2 as multiplier on 1 | 1x
1 as x off 2 | 0.5x
Multiplier change from one number to another
50 to 75 is what x | 1.5x
20 to 40 as x | 2x
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Outline
Calculations with mixed percentages & decimals
Fractions and Multipliers