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SSC MTS (Multi-Tasking Staff) Numerical and Mathematical Ability Flashcards
50 question-and-answer cards covering Numerical and Mathematical Ability as it is examined in SSC MTS (Multi-Tasking Staff). 24 of them are printed below, taken from across the deck — no signup, no paywall on the preview.
24 sample cards from the Numerical and Mathematical Ability deck
Sampled from the end of the deck, so these are different cards from the ones shown on the syllabus page.
What is the average (arithmetic mean) of a set of numbers?
Average = (Sum of all observations) / (Number of observations). Conversely, Sum = Average × Number of observations.
What is the average of the first n natural numbers, and of n consecutive numbers?
Average of first n natural numbers = (n+1)/2. The average of any set of consecutive (evenly spaced) numbers equals the average of the first and last terms: (first+last)/2.
How does adding/removing a member change an average (replacement rule)?
If a new value replaces an old one, the change in total = new value - old value, and change in average = (that difference)/(number of items). New sum = old average × old count ± adjustment.
Define cost price, selling price, profit, and loss.
Cost Price (CP) is the buying price; Selling Price (SP) is the selling price. If SP > CP, Profit = SP - CP; if SP < CP, Loss = CP - SP.
What are the formulas for profit percent and loss percent?
Profit% = (Profit/CP) × 100. Loss% = (Loss/CP) × 100. The cost price is always the base for these percentages.
How do you find SP from CP given a profit% or loss%?
SP = CP × (100 + Profit%)/100 for a profit; SP = CP × (100 - Loss%)/100 for a loss.
How do you find CP from SP given a profit% or loss%?
CP = SP × 100/(100 + Profit%) for a profit; CP = SP × 100/(100 - Loss%) for a loss.
Define marked price (list price) and discount.
Marked Price (MP) is the labeled/list price before reduction. Discount is a reduction on the MP. Discount = MP - SP, and Discount% = (Discount/MP) × 100 (MP is the base).
What is the relationship between Marked Price, Discount%, and Selling Price?
SP = MP × (100 - Discount%)/100. The discount is always calculated on the marked price, not the cost price.
What is the net effect of two successive discounts of x% and y%?
Equivalent single discount = x + y - (xy/100) percent. The combined discount is always less than the simple sum x + y.
What is the formula for Simple Interest?
Simple Interest (SI) = (P × R × T)/100, where P = principal, R = rate of interest per annum, T = time in years.
What is the formula for the Amount in simple interest?
Amount (A) = Principal + Simple Interest = P + (P×R×T)/100 = P(1 + RT/100).
In simple interest, how do you find the rate or time from SI?
R = (SI × 100)/(P × T) and T = (SI × 100)/(P × R). Rearrange the formula SI = PRT/100 for the unknown.
At what does money double under simple interest at rate R%?
Money doubles when SI = P, so PRT/100 = P, giving T = 100/R years. To triple, SI = 2P, so T = 200/R years.
What is the formula for Compound Interest (compounded annually)?
Amount A = P(1 + R/100)^T, and Compound Interest CI = A - P = P[(1 + R/100)^T - 1], where T is the number of years.
How is the amount formula adjusted for half-yearly and quarterly compounding?
Half-yearly: A = P(1 + (R/2)/100)^(2T). Quarterly: A = P(1 + (R/4)/100)^(4T). The rate is divided and the number of periods is multiplied accordingly.
For 2 years, what is the difference between Compound Interest and Simple Interest on principal P?
Difference (CI - SI) for 2 years = P × (R/100)^2. This is the interest on the first year's interest.
Why is compound interest greater than simple interest for the same P, R, and T (T>1)?
In compound interest, interest is calculated on the accumulated amount (principal plus past interest), so interest earns interest. In simple interest, interest is always on the original principal only.
In Time and Work, if a person completes a work in n days, what is their one-day work?
One day's work = 1/n of the total work. Conversely, if one day's work is 1/n, the whole work takes n days.
If A does a work in 'a' days and B in 'b' days, how long do they take together?
Combined one-day work = 1/a + 1/b. Time taken together = (a×b)/(a+b) days.
State the work equivalence formula relating men, days, and hours for two work scenarios.
(M1 × D1 × H1)/W1 = (M2 × D2 × H2)/W2, where M = men, D = days, H = hours/day, W = work done. Used to compare two situations.
How does efficiency relate to time taken in Time and Work problems?
Efficiency is inversely proportional to time: a more efficient worker takes less time. If A is twice as efficient as B, A takes half the time B takes to do the same work.
In Pipes and Cisterns, how are inlet and outlet pipes represented?
An inlet pipe fills the tank, so its work is positive (+1/x per hour). An outlet (leak/emptying) pipe drains it, so its work is negative (-1/y per hour).
If an inlet fills a tank in x hours and an outlet empties it in y hours, what is the net time to fill when both are open?
Net filling rate = 1/x - 1/y per hour. Time to fill = (x×y)/(y - x) hours, valid when y > x (so the tank actually fills).
What this deck covers
The Numerical and Mathematical Ability deck follows the SSC MTS (Multi-Tasking Staff) Numerical and Mathematical Ability syllabus — 6 chapters and 20 topics — so questions land on material that is genuinely examinable rather than trivia around it. That works out to roughly 8.3 cards per chapter.
Answers are written to be recallable, not just readable — averaging about 125 characters, which is long enough to carry the reasoning and short enough to say out loud.
A deck like this earns its keep on the second and third pass. Read the syllabus first so you know the shape of the subject, then use the cards to find the specific facts that have not stuck.
Numerical and Mathematical Ability flashcards FAQ
How many Numerical and Mathematical Ability flashcards are in this SSC MTS (Multi-Tasking Staff) deck?
50 cards. This page previews 24 of them, sampled evenly across the deck so you can judge the difficulty before installing anything.
Are these SSC MTS (Multi-Tasking Staff) flashcards free?
Yes. The preview here is free to read with no signup, and the full 50-card deck is free inside the Examius app.
What do the Numerical and Mathematical Ability cards cover?
They follow the SSC MTS (Multi-Tasking Staff) Numerical and Mathematical Ability syllabus — 6 chapters and 20 topics — so the questions track what is actually examinable.
How should I use these flashcards?
Read the syllabus first so you know the shape of the subject, then drill the deck. Examius schedules each card with spaced repetition, so cards you keep missing come back sooner and ones you know drift further apart.