90% of 20 = 18
18
90% of 20 is 18.
The working
20 × 0.9 = 18
Off and on
After the discount2
With it added38
A 90% discount takes off 18, leaving 2. Adding 90% as tax or tip brings it to 38.
The other way round
90 / 20450%
The whole20
90 is 450% of 20. And if 18 is the 90%, the whole was 20.
Other percentages of 20
90% of other numbers
10 → 920 → 1825 → 22.530 → 2740 → 3650 → 4560 → 5470 → 6375 → 67.580 → 7290 → 81100 → 90120 → 108125 → 112.5150 → 135200 → 180250 → 225300 → 270350 → 315400 → 360500 → 450600 → 540700 → 630750 → 675800 → 720900 → 8101,000 → 9001,200 → 1,0801,500 → 1,3502,000 → 1,8002,500 → 2,2503,000 → 2,7005,000 → 4,5007,500 → 6,75010,000 → 9,00015,000 → 13,50020,000 → 18,00025,000 → 22,50050,000 → 45,000100,000 → 90,000
How to read it
- Percent means hundredths. 15% is 0.15, so multiplying the base by 0.15 gives the answer.
- A discount subtracts, tax or tip adds. For the same 15%, the gap between the two results is twice the value.
- "What percent" is a division: 15 ÷ 200 × 100. When it does not come out even, the figure shown is rounded.
Common questions
Q. What is 90% of 20?
18. That is 20 × 0.9.
Q. What is 20 minus 90%?
2 — you take off 18.
Q. What is 20 plus 90%?
38, the figure with tax or a tip on top.
Q. If 18 is 90%, what is the whole?
20.