This is a valid and important question that most teachers don’t ever consider. You should ask this question about every topic being taught. Why should I learn about trigonometry? Or Shakespeare? Or sign language? Until students (children or adults) see a personal need for learning the topic, it becomes just another boring burden to be endured until it can be dumped.
Fractions were invented as a way of sharing things fairly.
This website presents extracts of each chapter in the related book called Fractions For Parents. The chapters are listed on the side of this page.
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