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Byju's Answer
Standard VII
Mathematics
Writing Rational Numbers as Decimals
Find the rati...
Question
Find the rational number which is represented by the following decimal numbers :
2.00
¯
¯¯¯¯
¯
12
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Solution
Let
r
=
2.00
¯
¯¯¯¯
¯
12
, then
100
r
and
10000
r
will be as follows:
100
r
=
100
×
2.00
¯
¯¯¯¯
¯
12
=
200.1212
1000
r
=
1000
×
2.00
¯
¯¯¯¯
¯
12
=
20012.1212
Now consider
10000
r
−
100
r
as shown below:
1000
r
−
100
r
=
20012.1212
−
200.1212
=
19812.00
⇒
9900
r
=
19812
⇒
r
=
19812
9900
⇒
r
=
1651
825
Hence, the required rational number is
1651
825
.
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