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Surds An Irrational Number is a real number that cannot be written as a simple fraction. Irrational means not Rational Example: 1.5 is rational, because.

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Presentation on theme: "Surds An Irrational Number is a real number that cannot be written as a simple fraction. Irrational means not Rational Example: 1.5 is rational, because."— Presentation transcript:

1 Surds An Irrational Number is a real number that cannot be written as a simple fraction. Irrational means not Rational Example: 1.5 is rational, because it can be written as the ratio 3/2 Example: 7 is rational, because it can be written as the ratio 7/1 Example (3 repeating) is also rational, because it can be written as the ratio 1/3

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4 How did we get the word "Surd" ? Well around 820 AD al-Khwarizmi (the Persian guy who we get the name "Algorithm" from) called irrational numbers "'inaudible"... this was later translated to the Latin surdus ("deaf" or "mute") If you can't simplify a number to remove a square root (or cube root etc) then it is a surd. Example: √2 (square root of 2) can't be simplified further so it is a surd Example: √4 (square root of 4) can be simplified (to 2), so it is not a surd! In fact "Surd" used to be another name for "Irrational", but it is now used for a root that is irrational.

5 Surds There are rules that we can follow that will allow us to simplify a surd as much as possible.

6 Example 1: This rule helps us simplify surds by splitting the surd into a surd and a non-surd. The non-surd can then be simplified into a whole number.

7 Example 2:


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