Mathematical Operations 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. Four signs and short expressions: “‘+’ means ‘×’” substitution, letter codes, which two signs to interchange, a given interchange, replacing the * signs, which equation becomes correct, which two numbers to interchange and a single custom operation. A steady score here means the chapter is exam-ready.
Level 2 Above SSC CGL Level Checking… View tests
Harder than the exam asks. Six- and seven-number expressions, two interchanges at once, signs and numbers interchanged together, an ‘=’ hidden among the * signs, two custom operations nested in brackets, finding x from a custom operation, and the missing number under a sign code. Wrong options are the slips students actually make: reading the code backwards, solving left to right and forgetting one of the changes.
Every mathematical operations question comes down to two steps: put the real signs in place, then apply BODMAS. The signs may be coded (“‘+’ means ‘×’”), swapped (“‘+’ and ‘×’ are interchanged”) or missing altogether (the * signs), but the arithmetic is always simple once the expression is written correctly.
Marks are lost in three places. The first is reading the code backwards — “‘+’ means ‘×’” turns every printed ‘+’ into ‘×’, not every ‘×’ into ‘+’. The second is solving from left to right instead of doing ÷ and × first. The third is changing only one occurrence of a sign when the question asks for every one to be interchanged.
How Many Mathematical Operations Questions Are Asked in SSC CGL?
Mathematical operations is a regular part of General Intelligence — usually one or two questions in a Tier I shift, and the same forms appear in CHSL. The forms it takes are listed below, most common first.
| Form of the question | How often |
|---|---|
| Sign or letter substitution — find the value | The most common form |
| Which two signs should be interchanged | Common |
| Replace the * signs to balance the equation | Common |
| Given interchange — find the value, or which equation becomes correct | Regular |
| Which two numbers (or two signs and two numbers) to interchange | Occasional |
| Custom operations (a # b = 2a + 3b) and the missing number | Less common |
Missing numbers in a figure or a matrix of numbers are practised in the separate Missing Number chapter.
What You Will Practice in the Mathematical Operations Chapter
Decoding the signs
- “‘+’ means ‘×’, ‘−’ means ‘÷’ …” — find the value of the expression
- Letters and symbols as codes for the four signs (A, B, C, D or @, #, $)
- The missing number in an equation written in coded signs
Interchanging signs and numbers
- Which two signs should be interchanged to make the equation correct
- A given interchange — find the value of the expression
- Which of four equations becomes correct after the change
- Which two numbers, or which two signs and two numbers, should be interchanged
Balancing and custom operations
- Replacing the * signs from left to right to balance the equation, with ‘=’ among them in Level 2
- Custom operations such as a # b = 2a + 3b, used once, twice or inside brackets
- Finding x when x # b is given
Rules worth knowing instantly
| Situation | What to do |
|---|---|
| Order of operations | BODMAS — ÷ and × first, then + and − |
| “‘+’ means ‘×’” | Every printed ‘+’ becomes ‘×’; nothing else changes because of this line |
| “‘+’ and ‘×’ are interchanged” | Every ‘+’ becomes ‘×’ and every ‘×’ becomes ‘+’ |
| Two numbers interchanged | The numbers change places; the signs stay where they are |
| Replace the * signs | Fill the option’s signs strictly from left to right |
| a # b = 2a + 3b | a is the number before the symbol, b the number after it; work brackets first |
Change all the signs first and only then calculate — mixing printed and real signs is where most wrong answers come from.
The three mistakes that cost the most marks
- Reading the code backwards. “‘+’ means ‘×’” replaces the printed ‘+’; it does not turn ‘×’ into ‘+’.
- Ignoring BODMAS. 7 + 6 × 2 is 19, not 26.
- Swapping the order in a custom operation. a # b and b # a are usually different numbers.
Solved Examples — SSC CGL Mathematical Operations
How the Mathematical Operations Tests Work
- 25 questions per test, with a full question palette — answered, skipped, marked for review, not visited.
- Every form in every level — substitution, letter codes, sign and number interchange, * signs and custom operations are mixed in each test, with the missing-number form added in Level 2.
- One answer only — every expression gives the same value whichever way a student orders ÷ and ×, so no option can be argued as correct.
- 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 — the expression is rewritten, worked by BODMAS, and every wrong option is checked.
- 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 Mathematical Operations for SSC CGL
- Write the code under the expression. Put the real sign below each printed one before you touch the numbers.
- Rewrite the whole expression once. Calculating while still decoding is how signs get mixed up.
- Do ÷ and × first, every time. Then add and subtract from left to right.
- In interchange questions, start with × and ÷. Moving them changes the value the most, so the right pair often shows up first.
- In * sign questions, read the end first. The last number and the right side usually rule out two options straight away.
- 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 54 chapter tests — Maths (35) · Reasoning (19)
- 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
- Series (Number, Letter & Alphanumeric)
- Alphabet Test
- Coding-Decoding
- Blood Relations
- Direction & Distance
- Time Sequence, Number & Ranking
- Seating Arrangement
- Syllogism
- Mathematical Operations
- 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 गणितीय संक्रियाएँ (Mathematical Operations) चैप्टर टेस्ट — हिंदी में
इस अध्याय में चिह्नों का प्रतिस्थापन (‘+’ का अर्थ ‘×’), अक्षरों और प्रतीकों के कूट, “किन दो चिह्नों को आपस में बदला जाए”, संख्याओं का परस्पर परिवर्तन, * चिह्नों के स्थान पर सही चिह्न रखकर समीकरण संतुलित करना और a # b = 2a + 3b जैसी नई संक्रियाएँ आती हैं। मूल नियम: पहले सभी चिह्न बदलें, फिर BODMAS लगाएँ — पहले भाग और गुणा, फिर जोड़ और घटाव।
सबसे आम गलतियाँ: कूट को उल्टा पढ़ना (‘+’ का अर्थ ‘×’ हो तो हर छपे ‘+’ की जगह ‘×’ आएगा), BODMAS छोड़कर बाएँ से दाएँ हल करना, और किसी चिह्न को केवल एक जगह बदलना।
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।