What is 30% of 20?
The answer is 6.
Result Explanation
30% of 20 = 6. If you are subtracting this as a discount, the discounted total is 20 − 6 = 14. If you are allocating, 6 is the allocated amount and 14 is the remainder.
Quick check: compare 20 × 0.30 with (30 ÷ 100) × 20; both should equal 6.
Why Six Lines Up With Twenty at Thirty Percent
Twenty factors into 2 × 10, and thirty percent lines up with tens cleanly: one tenth of twenty is two, so three tenths is six—a whole number, not a messy decimal. That is why homework sheets love this pair: you practise “percent means per hundred” without fighting rounding on the first pass.
The complement is seventy percent: 20 − 6 = 14, and 0.7 × 20 = 14. Recognising both forms helps when a label shows the price after a thirty-percent sale but hides the explicit discount—you subtract fourteen pounds from twenty to see the six-pound markdown, or read the six directly as thirty percent of the original.
Mental Maths Shortcuts for 30% of 20
Fastest for many people: 10% of 20 = 2, then 2 × 3 = 6.
- Double 30% of 10 = 3 because twenty is twice ten.
- From 20% of 20 = 4, add 10% of 20 (2) → 6.
- From 25% of 20 = 5, add 5% of 20 (1) → 6.
If you already memorised 15% of 20 = 3, doubling that rate mentally (two fifteens make thirty) lands on 6 without touching a calculator.
Real-World Examples
Example 1: Thirty percent off a £20 game
The saving is £6 and the reduced price before extras is £14.
Example 2: Class time
On a twenty-minute revision block, 30% of the clock is 6 minutes—often used as a rough “first pass” slice before a longer stretch of practice.
Example 3: Small-club subs
A youth team collects £20 per player and routes 30% to pitch hire in a simple budget. That line is £6 per player; the other £14 covers kits and coaching in that toy model.
Example 4: Inventory buffer
If twenty cartons arrive and the warehouse rules say to quarantine thirty percent for inspection, 6 cartons sit in the hold and 14 can flow to picking—again assuming the percentage applies to the count of cartons, not weight.
Common Mistakes
- Multiplying 30 × 20 = 600 and forgetting to divide by a hundred.
- Answering 14 when asked only for thirty percent of 20—fourteen is the remainder after a thirty-percent cut, not the cut itself.
- Confusing 30% of 20 with “20 is 30% of what?” which needs 20 ÷ 0.3, a much larger result.
- Treating 0.3% of twenty as if it were thirty percent—the tiny rate collapses the answer toward zero.
- Stopping after 10% of 20 = 2 and never tripling to reach 6.
Related Links
FAQ
What is 30% of 20?
30% of 20 is 6.
How do you calculate 30% of 20?
Multiply 20 by 0.3, or find 10% of 20 (which is 2) and multiply by 3.
What is 30% off 20?
30% off 20 is a reduction of 6, leaving 14.
Is 30% of 20 the same as increasing 20 by 30%?
No. Thirty percent of 20 is 6. Increasing 20 by 30% means adding 6 to get 26.