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Recurring decimals BTEOTSSBAT: ,[object Object]
Change recurring decimals into exact fractions,[object Object]
Recurring decimals = 0.3333333333333…… 3  1
Recurring decimals …  it keeps going on, it will never stop – we say it recurs. = 0.3333333333333…… 3  1
Recurring decimals …  it keeps going on, it will never stop – we say it recurs. = 0.3333333333333…… 3 We can write it in mathematical shorthand as:  1
Recurring decimals …  it keeps going on, it will never stop – we say it recurs. = 0.3333333333333…… 3 We can write it in mathematical shorthand as:  1 . 0.3333333333333…… = 0.3
0.12121212121212… Is another  recurring decimal
0.12121212121212… Is another  recurring decimal This can be written as 0.12 . .
0.12121212121212… Is another  recurring decimal This can be written as 0.12 . . In the same way  0.12341234123412341234 =
0.12121212121212… Is another  recurring decimal This can be written as 0.12 . . In the same way  0.12341234123412341234 = . . 0.1234
Recurring decimals as exact fractions Recurring decimals can easily be written as fractions. To do this: ,[object Object]
  write as many 9s as there are digits in the numerator as the bottom bit (denominator),[object Object]
Recurring decimals as exact fractions For example  Write 0.3 as an exact decimal  Here only one 3 is recurring  So the numerator is 3      3
Recurring decimals as exact fractions For example  Write 0.3 as an exact decimal  Here only one 3 is recurring  So the numerator is 3      3  3 There is one digit in the numerator so we have one 9 in the denominator 9
Recurring decimals as exact fractions For example  Write 0.3 as an exact decimal  Here only one 3 is recurring  So the numerator is 3      3  3  1 There is one digit in the numerator so we have one 9 in the denominator 9 This can then be cancelled down to be    3
. . 0.12
. . 0.12  12
. . 0.12 2 digits  12
. . 0.12 2 digits 99  12
. . 0.1234
. . 0.1234  1234
. . 0.1234  1234 4 digits
. . 0.1234  1234 4 digits 9999
. . 0.1234  1234 4 digits 9999
. . 0.12 2 digits 99  12 . . 0.1234  1234 4 digits 9999
. . 0.12 2 digits 99  12 . . 0.1234  1234 4 digits 9999
Now try these Write the following using the dot notation then convert them into exact fractions. 0.111111111…. 0.4343434343 …. 0.765765765 …. 0.237823782378237…
Now try these Write the following using the dot notation then convert them into exact fractions. 0.111111111…. 0.4343434343 …. 0.765765765 …. 0.237823782378237… . 0.1 0.43 0.765 0.2378 . . . . . .
Now try these Write the following using the dot notation then convert them into exact fractions. 0.111111111…. 0.4343434343 …. 0.765765765 …. 0.237823782378237… . 0.1 0.43 0.765 0.2378 . . . .  1  43  99 765  2378 999 . . 9   9999

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Recurring Decimals

  • 1.
  • 2.
  • 3. Recurring decimals = 0.3333333333333…… 3 1
  • 4. Recurring decimals … it keeps going on, it will never stop – we say it recurs. = 0.3333333333333…… 3 1
  • 5. Recurring decimals … it keeps going on, it will never stop – we say it recurs. = 0.3333333333333…… 3 We can write it in mathematical shorthand as: 1
  • 6. Recurring decimals … it keeps going on, it will never stop – we say it recurs. = 0.3333333333333…… 3 We can write it in mathematical shorthand as: 1 . 0.3333333333333…… = 0.3
  • 7. 0.12121212121212… Is another recurring decimal
  • 8. 0.12121212121212… Is another recurring decimal This can be written as 0.12 . .
  • 9. 0.12121212121212… Is another recurring decimal This can be written as 0.12 . . In the same way 0.12341234123412341234 =
  • 10. 0.12121212121212… Is another recurring decimal This can be written as 0.12 . . In the same way 0.12341234123412341234 = . . 0.1234
  • 11.
  • 12.
  • 13. Recurring decimals as exact fractions For example Write 0.3 as an exact decimal Here only one 3 is recurring So the numerator is 3 3
  • 14. Recurring decimals as exact fractions For example Write 0.3 as an exact decimal Here only one 3 is recurring So the numerator is 3 3 3 There is one digit in the numerator so we have one 9 in the denominator 9
  • 15. Recurring decimals as exact fractions For example Write 0.3 as an exact decimal Here only one 3 is recurring So the numerator is 3 3 3 1 There is one digit in the numerator so we have one 9 in the denominator 9 This can then be cancelled down to be 3
  • 17. . . 0.12 12
  • 18. . . 0.12 2 digits 12
  • 19. . . 0.12 2 digits 99 12
  • 21. . . 0.1234 1234
  • 22. . . 0.1234 1234 4 digits
  • 23. . . 0.1234 1234 4 digits 9999
  • 24. . . 0.1234 1234 4 digits 9999
  • 25. . . 0.12 2 digits 99 12 . . 0.1234 1234 4 digits 9999
  • 26. . . 0.12 2 digits 99 12 . . 0.1234 1234 4 digits 9999
  • 27. Now try these Write the following using the dot notation then convert them into exact fractions. 0.111111111…. 0.4343434343 …. 0.765765765 …. 0.237823782378237…
  • 28. Now try these Write the following using the dot notation then convert them into exact fractions. 0.111111111…. 0.4343434343 …. 0.765765765 …. 0.237823782378237… . 0.1 0.43 0.765 0.2378 . . . . . .
  • 29. Now try these Write the following using the dot notation then convert them into exact fractions. 0.111111111…. 0.4343434343 …. 0.765765765 …. 0.237823782378237… . 0.1 0.43 0.765 0.2378 . . . . 1 43 99 765 2378 999 . . 9 9999