Lesson 19: Squares, Cubes, Square Roots and Cube Roots Explained Visually | Class 8 Maths

Square numbers, cube numbers, square roots and cube roots explained with pictures: squaring numbers ending in 5, which digits a square can end in, estimating the square root of 50, and Ramanujan's number 1729. NCERT Class 8 Maths (Ganita Prakash), Chapter 1: A Square and A Cube. Lesson 19 of 76 in Brick by Brick Mathematics (Level 2 · Building Blocks): a free animated maths course that follows the NCERT Class 6–12 syllabus and builds up to olympiad problem solving. No formula is memorised; every rule is derived on screen. Chapters 0:00 Square numbers 0:30 Squaring a number ending in 5 1:10 How a square can end 1:37 Odd squares: the pinwheel 2:31 Square roots by prime factorisation 2:58 Estimating a square root 3:28 Cube numbers 3:39 Cubes add up to a square 4:11 Ramanujan's number 1729 4:27 Summary Key idea: Squares grow by L shapes, an odd square is a pinwheel of four rectangles plus one, roots come from splitting primes into equal groups, and cubes stack into squares. ◀ Previous: Lesson 18, Exponents and Powers    • Lesson 18: Exponents and Powers – Laws of ...   ▶ Next: Lesson 20, Ratio, Proportion, and Percentage    • Lesson 20: Ratio, Proportion and Percentag...   ▶ Full course, in order:    • Brick by Brick Mathematics: NCERT Class 6–...   Animations made with Manim. Narration is a synthetic voice (Kokoro text-to-speech). #Class8Maths #NCERT #NumberTheory #Maths