SNAP Percentages formula sheet, free to download as a 5-page PDF. Percentages questions sit inside SNAP's 20-question Quant, DI and DS section, and this sheet takes roughly eight minutes to work through, so it belongs in your final revision.

The sheet covers all five formula groups in real notation, and a concept video walks through the same rules with worked examples.

Built for revision, so every line trades explanation for speed. Read the working behind each formula in the full Percentages notes before leaning on this sheet.

Percentage Formula for SNAP: The Basic Definition and Fraction Table

Every percentage question comes down to the same first move: read the percentage as a multiplier, not as a separate step of arithmetic.

Formula: x% of N = (x/100) × N

20% of 80 is not "find 20, then find 80, then combine" − it is one multiplication, 0.2 × 80 = 16.

Memorising the fraction-to-percentage table converts awkward decimals into quick mental multiplication:

Formula: 1/6 = 16.67%, 1/8 = 12.5%, 1/10 = 10%, 1/20 = 5% (full table on the sheet)

37.5% of 216 done directly means multiplying by 0.375, which invites a slip. Converting 37.5% to 3/8 first and working out 216 × 3/8 = 81 in one line is both faster and safer.

Successive Percentage Change Formula for SNAP Quantitative Aptitude

When a value changes twice in a row, the two percentage changes never simply add:

Formula: net% = x + y + xy/100 (signs included)

Up 20% then down 20% gives 20 − 20 − 400/100 = −4%, a net loss rather than a wash, because the rise sits on the smaller number and the fall on the larger one.

Reversing a single change works the same way in miniature − going backwards, divide by the factor, never subtract the percentage. After a 20% rise to 600, the original is 600/1.2 = 500, not 600 minus 20% of 600.

Percentage Comparison Formula in SNAP: A More Than B vs B Less Than A

"A is x% more than B" and "B is x% less than A" are not mirror statements − they use different bases:

Formula: A is x% more than B ⇒ B is 100x/(100+x)% less than A

A is 25% more than B makes B only 20% less than A, not 25% less, because the first statement's base is B and the second's is A.

Percentage Concept Video for SNAP with Solved Examples

Source: iQuanta

How to Revise Percentages Before SNAP

The closing page repeats every formula in one table, each checked against a base of 100.

  • Cover the formula column and reproduce it from the quantity name
  • Say the base out loud before starting any calculation − percent of what?
  • Re-derive the net-of-two-changes formula rather than memorising the final expression alone
  • Check which statement's base applies before comparing two quantities

SNAP Percentages Formula Sheet FAQs

Ques. Is a x% increase followed by an x% decrease the same as no change?

Ans. No. Using the net-of-two-changes formula, x + (−x) + x(−x)/100 = −x²/100, which is always a loss, never zero. A 20% rise then a 20% fall is a 4% net loss.

Ques. If A is 25% more than B, is B 25% less than A?

Ans. No. B is 100x/(100+x)% less than A, which for x = 25 works out to 20%, not 25%. The two statements use different bases, so they are never mirror images.

Ques. Why does converting a percentage to a fraction save time?

Ans. Multiplying by a fraction like 3/8 is usually faster and less error-prone than multiplying by its decimal equivalent, 0.375, especially under exam time pressure.

Ques. How many questions does SNAP's Quant, DI and DS section carry?

Ans. SNAP's Quant, DI and DS section carries 20 questions out of the paper's total 60, based on the exam's current three-section structure.

Ques. Can the PDF be downloaded for free?

Ans. Yes. All 5 pages can be read on this page or downloaded at no cost, so it can be printed or kept on a phone for last-minute revision.