CHSL Math Questions Cheat Sheet

Key Definitions

• Arithmetic Mean: The sum of values divided by the number of values. ✅

• Median: The middle value in a sorted list of numbers. ✅

• Mode: The value that appears most frequently in a data set. ✅

Important Concepts

Number System

• Natural Numbers: Counting numbers starting from 1. ✅

• Integers: Whole numbers including negatives. ✅

• Rational Numbers: Numbers that can be expressed as a fraction. ✅

Algebra

• Linear Equations: Equations of the form ax + b = 0. ✅

• Quadratic Equations: Equations of the form ax^2 + bx + c = 0. ✅

Geometry

• Area of Circle: A = πr² ✅

• Pythagorean Theorem: a² + b² = c² ✅

Key Formulas

• Simple Interest: SI = (P × R × T) / 100 ✅

• P: Principal amount

• R: Rate of interest

• T: Time (in years)

• Compound Interest: A = P(1 + r/n)^(nt) ✅

• A: Amount

• n: Number of times interest applied per time period

Common Mistakes to Avoid

Common Mistake: Forgetting to convert percentages to decimals in calculations.

Memory Tricks

Tip: "PEMDAS" — Parentheses, Exponents, Multiplication, Division, Addition, Subtraction.

Key Diagrams

   +-------+
   |       |
   |   A   |
   |       |
   +-------+
      |
      | 
      +-------+
      |       |
      |   B   |
      |       |
      +-------+