Rounding and estimation

Scientific calculators are a wonderful invention, but theyre only as good as the people who use them. If you often get an unexpected or ridiculous result when you press the enter button, this free course, Rounding and estimation, is for you. Learn how to do a calculation correctly and get the right answer every time.

• Introduction
• Learning outcomes
• 1 Rounding
• 1 Rounding
• 1.1 Rounding in daily life
• 1.2 Rounding whole numbers
• 1.2.1 Rounding to the nearest hundred
• 1.2.2 Rounding to the nearest ten
• 1.3 Rounding in general
• 1.3.1 Try some yourself
• 1.4 Rounding decimals
• 1.4.1 Try some yourself
• 1.5 Significant figures
• 1.5.1 Try some yourself
• 1.6 Significant figures for numbers less than one
• 2 Estimation
• 2 Estimation
• 2.1 Using estimations
• 2.1.1 Try some yourself
• 3 Checking your answers
• 3 Checking your answers
• 3.1 Have I done the right calculation?
• 3.1.1 Try some yourself
• 3.2 Have I used the correct order for my calculation?
• Try some yourself
• 3.3 Have I given due consideration to units of measurement?
• 3.3.1 Try some yourself
• 3.4 Did I make a rough estimate to act as a check?
• 3.4.1 Try some yourself
• 3.5 Does the answer make sense in the real world?
• 3.5.1 Try some yourself
• 3.6 Additional practice
• 3.6.1 Try some yourself
• 4 OpenMark quiz
• 4 OpenMark quiz
• Conclusion
• Acknowledgements