20% of 120 is 24. One fifth of one-twenty is twenty-four: 120 ÷ 5 = 24. Decimals agree: 0.2 × 120 = 24. Because 120 = 100 + 20, add 20% of 100 (20) and 20% of 20 (4): 20 + 4 = 24. 10% of 120 is 12; doubling gives 24 again. On the same base, 25% of 120 is 30 and 30% of 120 is 36—so twenty percent is the whole-number fifth below those neighbours. 120 is also 10 dozen, and one fifth of that is 2 dozen (24)—a handy check in wholesale or catering counts.
Read 20% off £120 as “remove £24,” leaving £96 before extras. If someone asks for twenty percent of one-twenty—fee, slice, or allocation—the answer is 24, not ninety-six. The remainder only matches “after discount” wording.
Compare bases: 20% of 100 is 20, 20% of 110 is 22, and 20% of 130 is 26—each extra ten on the base adds two to the fifth at this rate. 20% of 90 is 18, so moving from ninety to one-twenty adds thirty to the base and six to the fifth (18 + 6 = 24).
Multiply the base by ten: 20% of 1200 is 240. If a one-twenty-pound subtotal becomes one thousand two hundred on the same percentage rule, the slice scales the same way—watch the decimal so you do not report 24 or 2400 by mistake.
If £120 is reduced by 20%, the reduction is £24 and you pay £96 (before other charges).
Change either value below to solve another percentage-of-number question instantly.
Formula used: (percentage ÷ 100) × number
Step 1: Convert 20% → 0.2.
Step 2: Multiply: 0.2 × 120 = 24.
Full formula: (20 ÷ 100) × 120 = 24
Fifth shortcut: 120 ÷ 5 = 24. Split: 20% of 100 + 20% of 20 = 20 + 4 = 24.
One-twenty is 12 × 10 (or 10 × 12 if you think in dozens). Twenty percent removes one factor of five from the product view 120 ÷ 5 = 24, which stays a whole number because 120 is divisible by both 10 and 12 in familiar ways.
Against 20% of 75 (15): adding forty-five to the base adds nine to the fifth, and 15 + 9 = 24—the same +1-per-+5 rhythm you see stepping up the tens through ninety, one hundred, one-ten, and one-twenty at this rate.
Fastest: 120 ÷ 5 = 24.
From 25% of 120 = 30, subtract 5% of 120 = 6 to land on twenty-four—useful if quarters come first mentally.
Example 1: Twenty percent off a £120 fee
The markdown is £24 and you pay £96 if nothing else stacks.
Example 2: One-twenty-unit batch
If a 20% quality hold applies, 24 units are ring-fenced and 96 are free to ship under a strict rule.
Example 3: Budget line
Allocating 20% of a £120 sub-budget means £24 for that line and £96 notionally elsewhere—not the other way round unless the wording says “after discount.”
Example 4: Tenfold check
20% of 1200 is 240. If you see 24 or 2400 on the scaled row, revisit the percent-to-decimal step.
20% of 120 is 24.
Multiply 120 by 0.2, divide 120 by 5, or double 10% of 120 (12 → 24).
20% off 120 is a reduction of 24, leaving 96.