Number Classification Tests — Pick a Level and Start
Tap a level to see every test in it. Level 1 is set at real SSC CGL difficulty — start there the day you finish the concept. Level 2 is pitched above the exam, to push accuracy under pressure.
Level 1 SSC CGL Level Checking… View tests
Same difficulty as the real SSC CGL paper — one clear property per question. Prime and composite, odd and even, perfect squares and cubes, multiples of a number, digit sums and palindromes. A steady score here means the chapter is exam-ready.
Level 2 Above SSC CGL Level Checking… View tests
Harder than the exam asks. All four numbers are odd, or all four are multiples of 3, and a quieter property decides — the digit product, the number of factors, the remainder on division, or a two-step rule. Wrong options are built from properties that almost fit.
Every classification question gives four items where three share one property and one does not. Find what the three have in common first, in one short sentence, and only then pick the item that breaks it — looking for “the strange one” without a rule is how the trap options win.
Marks are lost in three places. The first is stopping at the first rule that works — four items can often be split two ways, and only a rule that leaves exactly one out is right. The second is picking the least familiar item instead of the one that breaks the rule. The third is missing the quieter property — at Level 2 all four share the obvious feature and a second one decides.
How Many Number Classification Questions Are Asked in SSC CGL?
Classification (odd one out) is one of the steadiest chapters in SSC CGL reasoning — usually two to three questions in every Tier I shift and a few more in Tier II Paper I. More than 300 verbal classification questions have appeared in SSC papers from 2010 to 2024, and they split into the five chapters below.
| Classification chapter | Share of past SSC classification questions |
|---|---|
| Word Classification (single words) | 31% |
| Letter Classification (letters & clusters) | 30% |
| Number Classification (single numbers) | 12% |
| Number-Pair & Triad Classification | 20% |
| Word-Pair & Mixed Classification | 6% |
Shares are from SSC CGL, CHSL, MTS, Steno and CPO papers, 2010–2024 (figure-based questions are counted under Figure Classification). Word-pair questions are a small share of the older papers but the format SSC now uses most in Tier II; practise all five chapters so no format surprises you.
What You Will Practice in the Number Classification Chapter
Kinds of number
- Prime and composite numbers
- Perfect squares, perfect cubes and numbers that are neither
- Odd and even, and numbers with an odd count of factors
Divisibility and remainders
- Multiples of 3, 7, 9, 11 and 13
- Numbers with the same remainder on division
- Numbers divisible by the sum or product of their digits
Digits and patterns
- Digit sums, digit products and palindromes
- Reversed numbers and numbers with a repeated digit
- Two-step rules — a square plus one, a cube minus one
Tests worth running first
| Item | What to remember |
|---|---|
| Prime? | Only divisible by 1 and itself — check 2, 3, 5, 7, 11 |
| Perfect square? | Ends in 0, 1, 4, 5, 6 or 9; check the root |
| Perfect cube? | Check the cube root — 125, 216, 343 |
| Multiple of 3 or 9 | Digit sum divisible by 3 or 9 |
| Multiple of 11 | Alternating digit sum is 0 or 11 |
| Multiple of 4 | Last two digits divisible by 4 |
| Digit sum | Add the digits — do three match? |
| Palindrome | Reads the same backward |
Run two or three quick tests on all four numbers — the number that fails the test the other three pass is the answer.
The three mistakes that cost the most marks
- Testing only one property. A number can be odd and still be the odd one for another reason — check that your rule splits three from one.
- Treating 1 and 2 as ordinary primes. 1 is not prime, and 2 is the only even prime.
- Skipping the divisibility rules. Checking 3, 9 and 11 mentally is faster than dividing.
Solved Examples — SSC CGL Number Classification Questions
How the Number Classification Chapter Tests Work
- 25 questions per test, with a full question palette — answered, skipped, marked for review, not visited.
- Every question type in every level — the formats of this chapter are spread across the tests so no pattern is missed.
- Optional 15-minute timer — with the clock to build exam speed, without it while you are still learning the chapter.
- Marking: +2 correct, −0.5 wrong, 0 unattempted — the same scheme as the real paper.
- Solutions, shortcut tricks and concept notes open after you submit, question by question — every wrong option is explained too.
- English and हिंदी, chosen at the start of every test.
- Free with a TrickySSC account — sign in once with Google or your mobile number, and every test is open to you.
How to Prepare Number Classification for SSC CGL
- Run the quick tests first. Prime, square, cube, divisibility by 3, 9 and 11 settle most questions in seconds.
- Learn squares to 30 and cubes to 15. Recognising a perfect power on sight saves the most time.
- Use digit sums. A digit sum tells you the remainder on division by 3 and 9 at a glance.
- Split three from one. If a rule leaves two and two, it is the wrong rule.
- Look for a second property at Level 2. When all four share the obvious one, compare factors, remainders and digit products.
- Do Level 1 untimed first, then with the 15-minute clock. Move to Level 2 once Level 1 is steady, and then check yourself on a previous year paper.
All SSC CGL Chapter Wise Tests
Every chapter below has its own free Level 1 and Level 2 tests with full solutions.
Browse all 45 chapter tests — Maths (35) · Reasoning (10)
- Word Analogy
- Letter Analogy
- Number Analogy
- Number-Set & Triad Analogy
- Mixed Analogy
- Word Classification
- Letter Classification
- Number Classification
- Number-Pair & Triad Classification
- Word-Pair & Mixed Classification
- All Reasoning chapters →
- Number System
- Rule of Divisibility
- Remainder Theorem
- Decimal & Fraction
- LCM & HCF
- Square & Cube Root
- Number Series (AP & GP)
- Power, Indices & Surds
- Algebraic Formula
- Algebraic Result
- Algebraic Expression & Identities
- Percentage
- Profit & Loss
- Discount & Marked Price
- Simple Interest
- Compound Interest
- Ratio & Proportion
- Partnership
- Average
- Problems on Ages
- Mixture & Alligation
- Time & Work
- Pipe and Cistern
- Time, Speed and Distance
- Quadratic Equation
- Boat and Stream
- Races
- Trigonometry
- Heights & Distances
- Geometry
- Mensuration
- Coordinate Geometry
- Probability
- Statistics
- Data Interpretation
- All Maths chapters →
SSC CGL संख्या वर्गीकरण (Number Classification) चैप्टर टेस्ट — हिंदी में
संख्या वर्गीकरण (NUMBER CLASSIFICATION) में चार संख्याओं में से तीन में एक गुण होता है और एक में नहीं — अभाज्य, वर्ग, घन, गुणज और अंक-योग जैसी जाँचें चारों संख्याओं पर लगाइए। जो संख्या वह जाँच पास नहीं करती जो बाकी तीन करती हैं, वही उत्तर है।
सबसे आम गलतियाँ: केवल एक गुण जाँचना, 1 को अभाज्य मान लेना (1 अभाज्य नहीं है और 2 एकमात्र सम अभाज्य है), और 3, 9 व 11 की विभाज्यता के नियम न लगाना।
TrickySSC पर इस अध्याय के सभी टेस्ट हिंदी में उपलब्ध हैं — प्रश्न, विकल्प, विस्तृत हल और शॉर्टकट ट्रिक सब हिंदी में। दो स्तर हैं: लेवल 1 (SSC CGL के स्तर का) और लेवल 2 (SSC CGL से कठिन)। प्रत्येक टेस्ट में 25 प्रश्न, वैकल्पिक 15 मिनट का टाइमर और +2 / −0.5 की वही मार्किंग जो असली परीक्षा में होती है।