Quantitative Aptitude Short Tricks for SSC, Banking, and Railway Exams 2026

Percentage Short Tricks

Trick 1: x% of y = y% of x

32% of 25 = 25% of 32 = 8 (much easier!)

Trick 2: Successive Percentage Change

If a number increases by a% then decreases by b%, net change = a - b - (a*b)/100

Example: +20% then -20% = 20 - 20 - (400/100) = -4%

Profit & Loss Tricks

Trick 1: If CP = x, SP = y, Profit% = ((y-x)/x)*100

Trick 2: Dishonest Dealer

If a dealer sells at CP but uses false weight, Gain% = (Error/(True Value - Error))*100

Trick 3: Same Selling Price, Different Profits

If two articles sold at same price, one at x% profit and other at x% loss, Net Loss% = x^2/100

Simple & Compound Interest

SI Trick

SI = (P*R*T)/100. If P = 100, SI for 1 year at R% = R.

CI Trick

CI for 2 years at R% = 2R + R^2/100

CI for 3 years at R% = 3R + 3R^2/100 + R^3/10000

Ratio & Proportion

Componendo & Dividendo

If a/b = c/d, then (a+b)/(a-b) = (c+d)/(c-d)

Third Proportional

If a:b = b:c, then c = b^2/a

Time-Speed-Distance Tricks

Average Speed

If same distance at x kmph and y kmph, Average speed = 2xy/(x+y)

Relative Speed

Same direction: x-y. Opposite direction: x+y.

Time & Work

LCM Method

If A does work in 10 days, B in 15 days. LCM = 30. A=3 units/day, B=2 units/day. Together = 5 units/day. Time = 30/5 = 6 days.

Work Equivalence

If m1 men do w1 work in d1 days, m2 men do w2 work in d2 days: m1*d1/w1 = m2*d2/w2

Number System Tricks

Divisibility Rules

• By 7: Double last digit, subtract from rest. Repeat.
• By 11: (Sum of odd place digits) - (Sum of even place digits) = 0 or divisible by 11
• By 13: Add 4 times last digit to rest. Repeat.

FAQs

Last updated: June 02, 2026. Call +91-9804490328.