Math Tutorial 2.1 - Rounding and Significant Figures

There are 9 lessons in this math tutorial covering Rounding and Significant Figures. The tutorial starts with an introduction to Rounding and Significant Figures and is then followed with a list of the separate lessons, the tutorial is designed to be read in order but you can skip to a specific lesson or return to recover a specific math lesson as required to build your math knowledge of Rounding and Significant Figures. You can access all the lessons from this tutorial below.

In this Math tutorial, you will learn:

What is rounding? Why do we use it?
How many types of rounding are there? What are the corresponding digits that are associated to each of them?
How do we round numbers to the nearest ten?
How do we round numbers to the nearest hundred/thousand and more.
How to perform rounding in a number axis?
How to round non-whole numbers?
What are significant figures?
How to find the number of significant figures in a given value?
How are significant figures used in practice?

Introduction

Do you always write the exact number of items in a collection? Why?

How do we express the number of items in a collection if we are not sure about the exact value.

A calculator gives a value of 6.66666 cm when we want to find the side of an equilateral triangle if the perimeter is 20 cm. Is it correct to write the result in so many digits after the decimal place? Why?

We do not always need to know the exact value of something. In these situations we can use an approximate value to provide an idea of how large or small the quantity involved is. Usually, we use values ending with zero to represent these approximate values; we call these rounding. Let's take a closer look at this new operation.

Please select a specific "Rounding and Significant Figures" lesson from the table below, review the video tutorial, print the revision notes or use the practice question to improve your knowledge of this math topic.

Approximations Learning Material
Tutorial ID	Math Tutorial Title	Revision Notes	Revision Questions
2.1	Rounding and Significant Figures
Lesson ID	Math Lesson Title	Lesson	Video Lesson
2.1.1	What is Rounding
2.1.2	Rounding to the Nearest Ten
2.1.3	Rounding to the Nearest Hundred
2.1.4	Rounding to the Nearest Thousand
2.1.5	Explaining Rounding in the Number Axis
2.1.6	Other Types of Rounding
2.1.7	Significant Figures
2.1.8	Rules of Significant Figures
2.1.9	Applications of Significant Figures

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Continuing learning approximations - read our next math tutorial: Upper and Lower Bounds. Intervals and Segments

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