# O Level Math Lessons: Estimation and Approximation

In this O Level Math Lesson on estimation and approximation, we’ll cover these topics. You’ll find video lectures for each lesson below:

Lesson 1: Estimation Revision 1

Lesson 2: Significant Figures

Lesson 3: Estimation and Approximation (Significant Figures)

Lesson 4: Estimation: Square roots and cube roots

Lesson 5: More estimation: involving the 4 operations

## Lesson 1: Estimation Revision 1

In this lesson, let’s do a revision on estimation and approximation that you have learned in primary school. We cover rounding off to the nearest whole numbers, nearest tens, hundreds, thousands and nearest decimal place and so on.

## Lesson 2: Significant Figures

In this O Level Math Lesson, we look are what are significant figures.

## Lesson 3: Estimation and Approximation (Significant Figures)

Let’s talk about estimation and approximation to a certain number of significant figures in this lesson.

## Lesson 4: Estimation (square roots and cube roots)

In this lesson, we look at estimation of square roots and cube roots.

## Lesson 5: More Estimation

In this lesson, we look at extending estimation involving all the 4 operations and more.

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