Mathematics Lesson 1 Significant Figures Lesson Objectives: To learn how to round to significant figures and how to estimate Starter Complete then negative numbers worksheet H/W Due Next Lesson! Complete the significant figures worksheet.

When rounding to a given number of decimal places, sometimes you round up and sometimes you round down. Why? For example to 2dp becomes to 1dp becomes 56.8 What is the rule? Rounding

When rounding the rule is: ….. 5 or more…... round up….. less than 5…… leave it as it is For example 4.67 to 1dp becomes …… to 2dp becomes…….. What happens when your rounding to the nearest 10, 100 or 1000? What is 267 to the nearest 10? What is 346 to the nearest 100? Example

The Number of significant figures tells us how approximate we are allowed to be. For example 2377 to 1 significant figure is to 2 significant figures is to 3 significant figures is 2380 How does it work? Example

The number of significant figures tells us how many numbers other than zero we are allowed to have. Every thing else must be replaced with a zero. For example 5940 to 2sf becomes 5900 What is it to 1sf? Example

Exercise 2 Round the numbers to the given number of significant figures sf sf sf sf sf sf sf sf sf sf Exercise 1 Round the numbers to the given number of decimal places or the nearest 10, 100 or thousand dp dp dp dp dp Questions

Have We Met Todays Objectives? Significant Figures Lesson Objectives: To learn how to round to significant figures and how to estimate