# Working with errors and measurement

ACCURACY AND PRECISION

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- Absolute error
- Greatest possible error
- Relative error
- Percentage error

CALCULATIONS WITH NUMBERS THAT HAVE ERRORS

- Adding and subtracting numbers with errors
- Adding or subtracting an exact number
- Multiplication or division by an exact number
- Multiplication of numbers with errors
- Errors in multiplication – simple absolute error method
- Errors in multiplication – simple relative error method
- Multiplication of two numbers with large errors – long method
- Division with two numbers with small errors – simple relative error method
- Division with two numbers with large errors – long method
- When is an error large enough to use the long method?
- Land block sizing question