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7 December, 21:07

7. Write the number 0.21212121 ... as a fraction.

Let x =

100x =

100x - x =

99x =

x=

So 0.2121 ... is equal to

+2
Answers (1)
  1. 7 December, 22:02
    0
    21 / 99

    Step-by-step explanation:

    You want to get rid of the decimals so

    Let x = 0.21212121

    then 100x = 21.21212121

    then 100x - x = 21

    99x = 21

    x = 21 / 99

    So 0.2121 ... is equal to 21 / 99
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