Cheatbook

This document is a Class 10 Mathematics presentation on Real Numbers. It explains key concepts like Euclid’s Division Algorithm, Fundamental Theorem of Arithmetic, HCF and LCM, and their relationship. It also covers co-prime numbers, irrational numbers (like √2), and decimal expansions, making it useful for concept clarity and exam revision.

This document is a Class 8 Science presentation on Sound. It explains how sound is produced by vibrations, how it travels through different media, and how we hear it. It also covers properties of sound like pitch and loudness, along with noise pollution and its effects.