Recurring Decimals and Geometric Series (HSC SSCE Mathematics Advanced): Quizzes

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Recurring Decimals and Geometric Series
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What can any recurring decimal be expressed as?

An infinite geometric progression

What is the limiting sum formula for an infinite geometric series?

S=a1rS_{\infty} = \frac{a}{1-r}

If 2 digits recur in a decimal, what is the common ratio rr?

r=0.01r = 0.01

If 3 digits recur in a decimal, what is the common ratio rr?

r=0.001r = 0.001

What condition on rr ensures the geometric series converges to a finite value?

r<1|r| < 1

How is each term in a recurring decimal series obtained from the previous term?

By multiplying by the common ratio

What is the first term aa when converting 0.2˙7˙0.\dot{2}\dot{7} to a fraction?

a=0.27a = 0.27

How should non-recurring parts be handled in mixed recurring decimals?

Kept separate and added afterwards

What does 0.2˙7˙0.\dot{2}\dot{7} equal as a simplified fraction?

311\frac{3}{11}

What should always be done to the final fraction answer?

Simplify to lowest terms

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