Sectieoverzicht

  • Just as you can add, subtract, multiply and divide whole numbers you can also perform all of these operations with decimal numbers.

    We use decimals all the time. For example, when we need to give or receive change in coins from a note, we are then adding or subtracting decimals without even realising it.

    Picture of adding dollars

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      Add and subtract decimals

      We add and subtract decimals using the same method we do for whole numbers. Line up the numbers carefully according to place value. 

      Example

      \(25.6+15.465=41.065\)

      Adding decimals using place values

      The next video will take you through the steps for adding and subtracting decimals.
        
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      Multiply and divide decimals

      We multiply and divide decimals using different methods. In the video that follows you will go through an example of each method.

      Multiply decimals

      To multiply decimals we must get rid of the decimal point by multiplying each decimal by a power of 10, and then we must divide the answer by the same power of 10.

      Divide decimals

      To divide decimals; first write the division of decimals as a fraction and then multiply the numerator and the denominator by the same power of 10 – choose a power that will make the denominator a whole number.

      In the next video you will see examples of multiplying and dividing decimals.

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      Exercise: Practise working with decimals

      Try these exercises to check your ability to add, subtract, multiply and divide decimal numbers.

      Add decimals

      Subtract decimals

      Multiply decimals

      Divide decimals