Åk 6–9
  • Start
  • 1. Welcome to Operators and Calculation Rules
  • 2. Addition and Subtraction
  • 3. Multiplication And Division
  • 4. Factorization
  • 5. Setting Up Calculations
  • 6. Powers
  • 7. Square Roots
  • 8. Mathematical Rules
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    English/Русский
    2.6 Calculating by Approximation
    When you do rough estimates you look at the numbers and calculations and make an assessment of how you want to do an approximation. You round off the numbers before doing any calculations.

    Approximation when adding
    Below there are three examples of how to use approximation with addition.  Look at them and think about how you would do it.



    Examine which of the examples above you think is more appropriate when approximating and answer the following questions:

    Approximation when subtracting
    Below are three examples of how you can use approximation when subtracting.  Look at them and think about how you would do.

    Examine which of the examples above you think is the most appropriate when approximating and answer the question below: