Mathematics is an important section of the SSC CHSL Exam. To solve questions quickly and accurately, it is essential to memorize key formulas and learn simple tricks. This guide contains all the important formulas and short methods for easy revision before your exam.
HCF and LCM Formulas
Understanding Highest Common Factor (HCF) and Lowest Common Multiple (LCM) is useful for number theory problems. Memorize these simple formulas to save time.
| Concept | Formula |
| HCF × LCM | HCF × LCM = Product of the two numbers |
| HCF of two numbers | Divide numbers into prime factors and multiply common factors |
| LCM of two numbers | Divide numbers into prime factors and multiply all highest powers of factors |
Speed Maths Tricks for Simplifying Calculations
Quick calculation tricks help save time during the exam. Using these methods, you can solve sproblems faster without manual long calculations.
- Multiply by 11: Add the two digits and place the sum in between (e.g., 32 × 11 → 3 (3+2) 2 = 352).
- Squaring numbers ending with 5: Multiply the first digit(s) by its next number and add 25 at the end (e.g., 35² → 3×4=12 → 1225).
- Divisibility rules: Use simple checks for 2, 3, 4, 5, 9, 11 to quickly find divisible numbers.
Algebra Formulas
Algebra questions are common in SSC CHSL. Memorize these standard formulas to solve them quickly.
| Formula Type | Formula |
| (a + b)² | a² + 2ab + b² |
| (a – b)² | a² – 2ab + b² |
| a² – b² | (a + b)(a – b) |
| (x + a)(x + b) | x² + (a + b)x + ab |
| Cubes | a³ + b³ = (a + b)(a² – ab + b²) a³ – b³ = (a – b)(a² + ab + b²) |
Geometry Formulas
Basic Geometry is also important. Learn the key formulas for quick problem-solving.
| Shape | Formula |
| Triangle Area | ½ × base × height |
| Triangle Perimeter | Sum of all sides |
| Rectangle Area | Length × Breadth |
| Rectangle Perimeter | 2 × (Length + Breadth) |
| Circle Area | π × r² |
| Circle Circumference | 2 × π × r |
| Square Area | Side² |
| Square Perimeter | 4 × Side |
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Time, Speed, and Distance
Time, Speed, and Distance formulas help solve all problems related to motion and time efficiently.
- Speed = Distance ÷ Time
- Distance = Speed × Time
- Time = Distance ÷ Speed
- Average Speed = Total Distance ÷ Total Time
Profit, Loss, and Discount
Quick formulas for Profit, Loss and Discount mathematics questions.
- Profit = Selling Price – Cost Price
- Loss = Cost Price – Selling Price
- Profit % = (Profit ÷ Cost Price) × 100
- Loss % = (Loss ÷ Cost Price) × 100
- Selling Price after Discount = Marked Price – Discount
Simple Interest & Compound Interest
Simple Interest & Compound Interest maths questions can be solved quickly using these formulas.
| Type | Formula |
| Simple Interest | SI = (P × R × T)/100 |
| Compound Interest | CI = P × (1 + R/100)ⁿ – P |
Percentage Tricks
Percentage problems can be simplified with these methods:
- To find x% of a number → (x × number)/100
- To increase a number by x% → Number × (1 + x/100)
- To decrease a number by x% → Number × (1 – x/100)
FAQs
Q1. Why is it important to memorize SSC CHSL maths formulas?
Ans. Memorizing formulas helps you solve questions faster and accurately during the exam without wasting time on derivations.
Ans. Topics like HCF & LCM, Algebra, Geometry, Time-Speed-Distance, Profit-Loss, Simple & Compound Interest, and Percentage are frequently asked.
Ans. It is possible but time-consuming. Using formulas and tricks makes calculations quicker and reduces mistakes.
Ans. Speed maths tricks simplify calculations like multiplication, squaring numbers, or checking divisibility, saving precious time in the exam.
Ans. Yes, if you practice regularly with previous year questions, mocks, and apply formulas correctly, you can improve speed, accuracy, and score well.
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