92.9k views
0 votes
Express 1.4191919.......... in the form of p/q where p and q are integers and q is not equal to zero

User Timedt
by
6.9k points

1 Answer

5 votes

Answer:

281/198

Explanation:

You want the fraction equivalent of the rational number 1.41919....

Repeat

The given number has a 2-digit repeat, so we can express it as a fraction this way:

Multiply by 10^2, where the exponent is the number of repeating digits.

10X = 141.91919...

Cancel

Subtract the original number

10X -X = 141.91919... -1.41919... = 140.5 . . . . . now we have a finite decimal

99X = 140.5

Divide by 99 and express as a ratio of integers.

X = 140.5/99 = 281/198 . . . . . . multiply by 2/2

1.4191919... = 281/198

__

Additional comment

Having done this before, we know that 0.191919... = 19/99. Then 1.91919... is 10 times that, or 190/99. This number has a 9 in the tenths place, not a 4, so is 0.5 more than the required number. Our number is ...

190/99 - 1/2 = (380 -99)/(99·2) = 281/198

<95141404393>

Express 1.4191919.......... in the form of p/q where p and q are integers and q is-example-1
User Zanson
by
7.5k points