Year 8 Interactive Maths - Second Edition

## Projects

### Project 8.1  Percentage Error

1a.  Estimate the length of the following horizontal line without measuring and record your estimate.

1b.  Measure the length of the above line in millimetres (to the nearest millimetre), and record your measured length.

1c.  Find the error of your estimate for the length of the line to the nearest millimetre.

1d.  Find the relative error of your estimate relative to the measurement of the length of the line.  Express your answer as a decimal number.

1e.  Find the percentage relative error of your estimate relative to the measurement of the length of the line.

2a.  Estimate the length of the following vertical line without measuring and record your estimate.

2b.  Measure the length of the above line in millimetres (to the nearest millimetre), and record your measured length.

2c.  Find the error of your estimate for the length of the line to the nearest millimetre.

2d.  Find the relative error of your estimate relative to the measurement of the length of the line. Express your answer as a decimal number.

2e.  Find the percentage relative error of your estimate relative to the measurement of the length of the line.

3a.  Estimate the length of the following oblique (i.e. sloping) line without measuring and record your estimate.

3b.  Measure the length of the above line in millimetres (to the nearest millimetre), and record your measured length.

3c.  Find the error of your estimate for the length of the line to the nearest millimetre.

3d.  Find the relative error of your estimate relative to the measurement of the length of the line.  Express your answer as a decimal number.

3e.  Find the percentage relative error of your estimate relative to the measurement of the length of the line.

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