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Recurring Decimals

Change recurring decimals into their corresponding fractions and vica versa.

Level 1 Level 2 Exam-Style Help More Decimals

Do not use a calculator. You can earn a trophy if you get at least 9 questions correct and you do this activity online.

1. This is a recurring decimal number: \(0.22222222\)... Which digit is recurring?

Correct Wrong

2. This is a recurring decimal number: \(0.43888888\)... Which digit is recurring?

Correct Wrong

3. A recurring decimal number can also be written like this: \(0.\dot 9\). Which digit is recurring?

Correct Wrong

4. For this number: \(0.17\dot 6\dot 4\). Which group of digits are recurring?

Correct Wrong

5. For this number: \( 0.198 \dot 621 \dot 4 \). What is the period of the recurrence?

Correct Wrong

6. Convert the fraction \( \frac{1}{3} \) to a decimal correct to 3 decimal places.

Correct Wrong

7. Convert the fraction \( \frac{2}{3} \) to a decimal correct to 5 decimal places.

Correct Wrong

8. Convert the fraction \( \frac{2}{9} \) to a decimal correct to 3 decimal places.

Correct Wrong

9. Convert the fraction \( \frac{6}{11} \) to a decimal correct to 5 decimal places.

Correct Wrong

10. Write the number \( 3 \frac{11}{12} \) as a decimal correct to 7 decimal places.

Correct Wrong

11. Write the number \( 4 \frac{10}{13} \) correct to 16 significant figures.

Correct Wrong

12. What is the period of recurrence of the decimal representing the fraction \( \frac{11}{13} \) ?

Correct Wrong
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This is Recurring Decimals level 1. You can also try:
Level 2

Instructions

Try your best to answer the questions above. Type your answers into the boxes provided leaving no spaces. As you work through the exercise regularly click the "check" button. If you have any wrong answers, do your best to do corrections but if there is anything you don't understand, please ask your teacher for help.

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Wednesday, August 30, 2017

"Here's something to think about, discuss with your friends and share with your teacher:

What is the difference between \(0.\dot 9\) and one?
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Help

A decimal with a repeating digit (or set of digits) is called a recurring decimal.

For example \(0.77777777...\) is a recurring decimal and is called "nought point seven recurring"

\(9.247347347...\) is also a recurring decimal and is called "nine point two four seven recurring"

The period of a recurring decimal is the number of digits in the repeating section so for the second example above the period is three.

A more efficient way of writing out a recurring decimal is by only writing the repeating digit once but putting a dot over the first and last number in the repeating sequence. Another method is drawing a line over the repeating digit or digits.Here are some examples.

\(0.333333333... = 0.\dot 3 = 0.\overline 3\)

\(0.76531531531... = 0.76\dot 53\dot 1 = 0.76\overline{531}\)

A fraction can be converted to a decimal using long division; dividing the numerator by the denominator. If the decimal is recurring the repeating pattern of numbers will be spotted in the long division working. The following example shows the repeating patterns when converting \( \frac{7}{11} \) to a decimal:

Using long division to convert a fraction into a recurring decimal

There are two common methods for converting a recurring decimal to a fraction:

Method 1

1 repeating digit

Let the recurring decimal be represented by \(x\)

$$x = 0.8888888...$$

Multiply both sides by 10 (as there is one repeating digit)

$$10x = 8.8888888...$$

Subtract the first equation from the second

$$9x = 8$$ $$x = \frac{8}{9}$$

2 repeating digits

Let the recurring decimal be represented by \(x\)

$$x = 1.36363636...$$

Multiply both sides by 100 (as there are two repeating digits)

$$100x = 136.36363636...$$

Subtract the first equation from the second

$$99x = 135$$ $$x = \frac{135}{99}$$ $$x = \frac{15}{11}$$

3 repeating digits

The method is the same but multiply both sides by 1000.

Method 2

1 repeating digit

Example: convert \(0.8888888...\) to a fraction.

This method requires you to know that \(\frac19 = 0.1111111...\)

\(0.8888888...\) is exactly eight times \(0.1111111...\)

$$\therefore 0.8888888... = \frac{8}{9}$$

2 repeating digits

Example: convert \(0.45454545\) to a fraction in its lowest terms.

This method requires you to know that \(\frac{1}{99} = 0.01010101...\)

\(0.45454545...\) is exactly forty five times \(0.01010101...\)

$$\therefore 0.45454545... = \frac{45}{99}$$ $$0.45454545... = \frac{5}{11}$$

3 repeating digits

Example: convert \(0.\dot 61\dot 2\) to a fraction in its lowest terms.

This method requires you to know that \(\frac{1}{999} = 0.\dot 00\dot 1\)

\(0.\dot 61\dot 2\) is exactly six hundred and twelve times \(0.\dot 00\dot 1\)

$$\therefore 0.\dot 61\dot 2 = \frac{612}{999}$$ $$0.\dot 61\dot 2 = \frac{68}{111}$$

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