What is 20% of 10?
The answer is 2.
Result Explanation
20% of 10 = 2. Because 20% is one fifth, you can also do 10 ÷ 5 = 2. If you mean 20% off 10, then 2 is the discount and the new total is 8 (use the discount calculator to see the before/after).
If you’re comparing two values (not taking a slice of one number), use the percentage change calculator. For reverse problems like “10 is 20% of what?”, use the reverse percentage calculator.
Why Two Is the Natural Answer Here
Ten splits evenly into five equal parts of two. A twenty-percent share is exactly one of those parts, so the answer is a counting number, not a fragment like 1.5 or 2.5 you get from fifteen or twenty-five percent on the same base. On larger whole bases the fifth can still land on an integer—20% of 30 is 6, for instance—while bases such as 12 force 2.4 and reintroduce decimals.
If you frame the problem as “what is two tenths of ten,” you are really asking for 0.2 × 10, which reinforces that “percent” means “per hundred” even when the base is ten: the hundredths and the base’s tens column interact to drop the decimal in the right place.
Mental Maths Shortcuts for 20% of 10
The fastest path is the fifth: 10 ÷ 5 = 2.
- 10% of 10 = 1; doubling gives 20% = 2.
- 5% of 10 = 0.5; four of those make 2 (less common, but valid).
If you already know 30% of 10 is 3, shaving off 10% of 10 (which is 1) lands on 2 again—useful when your head holds round tens more easily than fifths.
Real-World Examples
Example 1: Twenty percent off a £10 book
The saving is £2 and the reduced shelf price is £8 if nothing else is added at checkout.
Example 2: Pocket-money allocation
Setting aside twenty percent of a £10 weekly allowance reserves £2 for savings or a goal jar, leaving £8 for spending if that is the rule you agreed.
Example 3: Small-batch craft sale
If material for ten units costs £10 and you earmark 20% of that line for wastage, you budget £2 of slack, not £8—the question asked for the percentage of the cost, not the remainder after removing it.
Example 4: Comparing rates on the same tenner
Fifteen percent takes £1.50, twenty percent takes £2, twenty-five takes £2.50. Seeing all three on one base clarifies how fast the slice grows when the headline discount jumps by five points.
Common Mistakes
- Multiplying 20 × 10 and forgetting to divide by a hundred, then wondering why the answer “feels” like 200.
- Answering £8 when the question only asked for twenty percent of £10—that eight pounds is the price after a twenty-percent discount, not the discount amount.
- Treating 20% of 10 the same as “10 is 20% of what?”—the latter needs 10 ÷ 0.2 = 50, a completely different story.
- Using 2 as the discounted total when the wording said “add twenty percent fee on ten,” where the new total would be 12.
- Confusing 0.2% of ten with 20% of ten—moving the decimal one extra place collapses the answer toward zero.
Related Links
FAQ
What is 20% of 10?
20% of 10 is 2.
How do you calculate 20% of 10?
Multiply 10 by 0.2, or divide 10 by 5 because 20% is one fifth.
What is 20% off 10?
20% off 10 is a reduction of 2, leaving 8.