Lesson 19 Accuracy and errors

Worksheet 3 Acceptable errors in rounding

  1. Round the numbers in the table in two different ways.

For each find the ratio of error to the original number, as a percentage.

How good are the approximations?



2. John says ‘Rounding a large number to the first two places is the same as reading to the smaller marks in a number line like this’:


Write one of your approximations from question 1 on this number line. Label the larger markers only.

Is this helpful in understanding rounding?





Thinking Mathematics Lessons Copyright © by Michael Shayer and Mundher Adhami. All Rights Reserved.

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