30% of 20 is 6. Think of twenty as two tens: 30% of 10 is 3, so doubling the base doubles the slice—3 × 2 = 6. The fraction view matches: 3/10 × 20 = 6. With decimals, 0.3 × 20 = 6 with no rounding. On the same base, 20% of 20 is 4 and 25% of 20 is 5, so thirty percent is the next whole step upward in that little ladder—handy when a headline discount jumps from “a fifth” or “a quarter” to “nearly a third.”
30% off £20 means the discount line is £6 and you would pay £14 before delivery or tipping. If the question is strictly “what is thirty percent of twenty?” you answer 6, not fourteen—fourteen is what is left after the reduction, not the reduction itself.
Scaling again: doubling twenty to forty doubles the share—30% of 40 is 12. Halving the base to ten brings you back to 3. That symmetry is useful when a spreadsheet row is literally double another row with the same percentage column, or when you sanity-check a till receipt against a mental model built on ten-pound notes.
Because 10% of 20 is 2, tripling that ten-percent slice is often the quickest route under pressure: 2 × 3 = 6. That habit transfers to any base where moving one decimal for ten percent is easy—twenty, two hundred, two thousand—before you reach bases where ten percent stops being a two-second move.
If £20 is reduced by 30%, the reduction is £6 and you pay £14 (before other charges).
Change either value below to solve another percentage-of-number question instantly.
Formula used: (percentage ÷ 100) × number
Step 1: Convert 30% → 0.3, or note that thirty percent is three tenths of the whole.
Step 2: Multiply: 0.3 × 20 = 6.
Full formula: (30 ÷ 100) × 20 = 6
Ten-percent bridge: 10% of 20 = 2; three of those make 6. Same answer as 20 × 0.3, often faster if you already spotted that ten percent is two.
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.
Fastest for many people: 10% of 20 = 2, then 2 × 3 = 6.
If you already memorised 15% of 20 = 3, doubling that rate mentally (two fifteens make thirty) lands on 6 without touching a calculator.
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.
30% of 20 is 6.
Multiply 20 by 0.3, or find 10% of 20 (which is 2) and multiply by 3.
30% off 20 is a reduction of 6, leaving 14.
No. Thirty percent of 20 is 6. Increasing 20 by 30% means adding 6 to get 26.