Decimal
0.1 × 20 = 2
Fraction
⅒ of 20 = 2
Equation
(10 ÷ 100) × 20 = 2
How to calculate 10% of 20
A single mental-math step gets you there directly.
- 1
Move the decimal one place left
20 → 2. 10% of any number just shifts the decimal by one digit.
Where 10% of 20 comes up in practice
A 10% tip on a $20 restaurant bill comes out to $2.00, bringing the total to $22.00.
How to read this number
- 10% used to be the default US restaurant tip but now reads as low. A $2.00 tip on a $20.00 bill is below current 15–20% norms.
Mental math shortcut
Move the decimal point one place to the left.
The same calculation, expressed three ways
Knowing one of these gives you the other two — handy when a problem is phrased differently to what you typed.
- 2 is 10% of 20
- 2 out of 20 = 10%
- 10% off $20.00 = $18.00
Frequently asked
Common follow-up questions for 10% of 20.
Yes — multiplying by the decimal form (0.1) is exactly what "10% of 20" means. 20 × 0.1 = 2.
10% equals ⅒. So ⅒ of 20 = 2, which is the same answer reached the long way.
No — 10% of $20 is the discount amount itself ($2.00). 10% off $20 means the sale price is $18.00 (the original price minus the discount).
Move the decimal point one place to the left. For 10% of 20 that gives 2 directly.
The number is 20. To work it out, divide 2 by 0.1: 2 ÷ 0.1 = 20.
Total = $22.00. The bill ($20) plus a 10% tip ($2.00) = $22.00.
Need a different calculation?
Use the full Percentage Calculator — five modes including reverse calculations, percentage change, and percentage difference.
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