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You know that 1/7=0.142857. Can you predict what the decimal expansions of 2/7, 3/7, 4/7, 5/7, 6/7  are, Without actually doing the long division? If so, how? - CBSE Class 9 - Mathematics

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Question

You know that `1/7=0.bar142857.` Can you predict what the decimal expansions of `2/7, 3/7, 4/7, 5/7, 6/7`  are, Without actually doing the long division? If so, how?

[Hint : Study the remainders while finding the value of `1/7` carefully.]

Solution

Yes, it can be done as follows

`2/7=2xx1/7=2xx0.bar142857=0.bar285714`

`3/7=3xx1/7=3xx0.bar142857=0.bar428571`

`4/7=4xx1/7=4xx0.bar142857=0.bar571428`

`5/7=5xx1/7=5xx0.bar142857=0.bar714285`

`6/7=6xx1/7=6xx0.bar142857=0.bar857142`

  Is there an error in this question or solution?

APPEARS IN

 NCERT Solution for Mathematics Class 9 (2018 to Current)
Chapter 1: Number Systems
Ex.1.30 | Q: 2 | Page no. 14

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Solution You know that 1/7=0.142857. Can you predict what the decimal expansions of 2/7, 3/7, 4/7, 5/7, 6/7  are, Without actually doing the long division? If so, how? Concept: Real Numbers and Their Decimal Expansions.
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