The approximation of π is a popular pastime of students of mathematics and I have started with the familiar age-old way, of fitting a regular polygon tightly in a circle of radius r. The vertices of the n-sided polygon are joined to the centre of the circle so that the angle subtended at the centre by each segment is 360/n. If n is sufficiently large, the perimeter of the polygon approaches the circumference 2πr of the circle and this approximation improves as the number of segments increases.

Here are some activities we compiled it for you that introduce & explore the beauty & universality of pi. Try this today, and celebrate World Pi Day.

1. Take any circlular of your choice. Draw 4 of them next to each other as shown. 

Here is a worksheet on Measurement of weight for children in the primary school. This fun yet challenging worksheet can be used as a revision or an assessment worksheet. The complexity of the problems increases with every page
Circle on the best unit to measure the weight of the following:
Children need to understand that some contexts require precision to a fine degree while some require approximate figures. A strong foundation in measurement concepts leads to a better understanding of decimal numbers in particular.

..and other rational approximations to π

In this article, the writer will explain a method to find rational approximations for and other irrational numbers. The key idea here is to use a calculator to find what is called a continued fraction for an irrational number.

How can a simple series of folds on a strip of paper be a mathematical exercise? The article, by Shiv Gaur,  describes not only the how but also the why…..based on Fujimoto’s Approximation Method.

The ability to estimate is a practical skill used frequently in our lives. Whether it is gauging sizes or planning budgets, organizing activities and events, or marketing a product. Guessing games go a long way in developing this skill in children.

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