An exercise on rounding values in a calculation to find an approximate estimate of the answer.
This is level 1: round the numbers in a basic calculation to one significant figure to obtain an approximate answer. You will be awarded a trophy if you get at least 9 correct and you do this activity online.
Try your best to answer the questions above. Type your answers into the boxes provided leaving no spaces. As you work through the exercise regularly click the "check" button. If you have any wrong answers, do your best to do corrections but if there is anything you don't understand, please ask your teacher for help.
When you have got all of the questions correct you may want to print out this page and paste it into your exercise book. If you keep your work in an ePortfolio you could take a screen shot of your answers and paste that into your Maths file.
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Mathematicians are not the people who find Maths easy; they are the people who enjoy how mystifying, puzzling and hard it is. Are you a mathematician?
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There are answers to this exercise but they are available in this space to teachers, tutors and parents who have logged in to their Transum subscription on this computer.
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Rounding - Before doing these exercises you will need to know how to round numbers to one significant figure.
Level 1 - Round the numbers in a basic calculation to one significant figure to obtain an approximate answer
Level 2 - Round the numbers to one significant figure to obtain an approximate answer to calculations including decimals and fractions
Level 3 - Determine whether an approximation is a over-estimate or an under-estimate if each of the numbers are rounded to one significant figure
Level 4 - Real life problems and puzzles
Bounds - Determine the upper and lower bounds when rounding or truncating quantities used in calculations.
Exam Style Questions - A collection of problems in the style of GCSE or IB/A-level exam paper questions (worked solutions are available for Transum subscribers).
Breathe Easily - A real-life question that can be (roughly) answered by making some approximations.
Fermi Problem - Unleash your approximating skills to estimate something quite unknown in this Advanced Starter.
More on this topic including lesson Starters, visual aids, investigations and self-marking exercises.
See the National Curriculum page for links to related online activities and resources.
The video above is from the maths520 channel.
Don't wait until you have finished the exercise before you click on the 'Check' button. Click it often as you work through the questions to see if you are answering them correctly. You can double-click the 'Check' button to make it float at the bottom of your screen.