CBSE Class 8 Mathematics — Flashcards for Quick Revision

A: A square number is obtained by multiplying a number by itself. It is written as n² = n × n. First five square numbers: 1² = 1, 2² = 4, 3² = 9, 4² = 16, 5² = 25

A: They are called squares because they represent the area of a square. For example, a square with side length 3 units has area 3 × 3 = 9 square units. The area equals the square of the side length.

A: Perfect squares can only end with the digits: 0, 1, 4, 5, 6, or 9. Perfect squares CANNOT end with: 2, 3, 7, or 8. This property helps identify non-squares quickly.

A: Exponential notation is a way to write repeated multiplication using a base and exponent. 5⁴ means 5 × 5 × 5 × 5 = 625. It is read as '5 raised to the power 4' or '5 to the power 4' or 'the 4th power

A: 3⁷ (3 raised to the power 7). Here, 3 is the base and 7 is the exponent, meaning 3 is multiplied by itself 7 times.

A: When multiplying powers with the same base, add the exponents: nᵃ × nᵇ = nᵃ⁺ᵇ. Example: 2³ × 2⁵ = 2³⁺⁵ = 2⁸ = 256.

A: A number system is a standard sequence of objects, names, or written symbols that have a fixed order, used for counting and representing quantities. It provides a consistent way to express numbers.

A: Numerals are the symbols used to represent numbers in a written number system. For example, 0, 1, 5, 36, 193 are numerals in the Hindu number system.

A: One-to-one mapping is associating each object to be counted with another object (like a stick or pebble), ensuring no two objects are mapped to the same item. Ancient people used this method by keepin