In this set of Math Tutorials we cover Approximations in details with clear guides, Approximations formulas and working examples. Each tutorial includes example questions, a revision guide and supporting Approximations calculators

We also provide online Approximations Calculators which allow you to calculate specific Approximations formula in support of the tutorials or to check and verify your own calculations in support of your Approximations homework, math coursework or to help you improve your own understanding so it is easier to teach your children Approximations.

Approximations Learning Material and Approximations Study AideTutorial ID | Title | Tutorial | Video Tutorial | Revision Notes | Revision Questions | |
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**2.1** | Rounding and Significant Figures | | | | |

**2.2** | Upper and Lower Bounds. Intervals and Segments | | | | |

## Introduction to Math Chapter 2: Approximations

This short chapter is dedicated to rounding as a suitable method for expressing numbers when the exact value is not relevant. The rules for rounding numbers to the nearest 10, 100, 1000, 10000, etc., are explained and illustrated with examples.

Another interesting element in this chapter is "significant figures" - a useful method to write numbers with as many digits as needed. The rules of significant figures including the exponential form of number are explained and illustrated with examples.

We also explain the concepts of lower and upper bound, determined by intervals and segments (including half intervals and half segments) - another useful element of number sets is discussed during this tutorial.

### Approximations Calculators

The following Math Calculators are provided in support of the Approximations tutorials.