Introduction

Imagine... one morning you wake up in a strange world - a world without numbers. How would your day go?

You look at your phone but can't read the time. The weather app shows only "...degrees" outside. You try to meet your friend at their apartment, but all building addresses have vanished!

In class, your teacher can't take attendance because student IDs don't exist. At lunch, you can't pay for your meal since currency relies on numbers. You want to bake cookies but the recipe measurements have disappeared.

Think about more ways life would change in this numberless world! You can't track your high score in video games. Sports become chaotic - no one knows the score of the basketball game. The library can't organize books without shelf numbers. Even sharing pizza becomes tricky - how do you split it fairly among friends without counting slices?

These situations show us why numbers and basic mathematical operations are so fundamental to our daily lives. Whether we're measuring ingredients, keeping score, paying for things, or sharing items fairly - we need numbers and division rules. Let's explore these fundamental operations and divisibility rules that help bring order to our world.