Chapter 3: Approximation and Estimation - Decimals & Significant Figures

In this chapter, we will learn to

• Round off numbers to a required number of decimal places
• Round off numbers to a required number of significant figures
• Estimate the results of computation
• Understand the concepts of rounding & truncation errors
  

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Let's revisit something we know...
Rounding Off Numbers to a required number of Decimal places





Quick Notes:

• What is rounding?
• Rules for rounding
• Rounding tens, hundreds and thousands

Try the following to recall what you are familiar with...

Activity 1: BBC Skillwise "Rounding & Estimating Number" Quiz

• http://www.bbc.co.uk/skillswise/numbers/wholenumbers/whatarenumbers/rounding/quiz.shtml

Activity 2: Rounding Quiz

• Here's another quiz to round numbers to the nearest thousands, ten thousands, hundred thousands, and millions.
  
• Click at "CLICK HERE TO TAKE TEST" to start the quiz.
  
• http://www.softschools.com/quizzes/math/rounding/quiz837.html

Activity 3: Half Court Rounding

• This is a game that you can choose to 'earn' 1, 2 or 3 points in each successful 'throw' of the basketball
• http://www.mrnussbaum.com/rounding/index.html
  

Activity 4: Estimation Valley Golf

• In this game, you will complete the course using estimation skills in as few strokes as possible.
• http://www.mrnussbaum.com/estimationvalley.htm