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# Rational numbers - Computers & Internet

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Posted on Oct 17, 2013

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### How do I tell wether a number is rational or irrational?

If a number can be expressed as a ratio of two whole numbers then it's rational.
Alternatively, if a number can be expressed in decimal with a finite number of digits or as a repeating decimal then it's rational.

Oct 12, 2014 | Computers & Internet

1 Answer

### Are all integers rational numbers

All integers are rational numbers. The easiest way to see that is to write an integer as a fraction with 1 as a denominator; 4=4/1=8/2; 5=5/1.
Any number that can be written as a ratio of two integers numbers is by definition a rational number ( it is a ratio---rational).
Any decimal number with a periodic decimal part can be cast as a fraction, so it is rational.
An irrational number is a number that cannot be written as a fraction.
Examples: PI, sqRT(2), Sqrt(3), SQRT(5), e. There is an infinite number of them.

Sep 15, 2014 | Computers & Internet

1 Answer

### I dont know what the opposite of a rational number

The opposite of any number (be it integer, rational, or real) is the same number preceded by the negative sign.
Example : the opposite of a is -a (read it a negative a)
opposite of (-b) is -(-b)=b
A rational number is a number that can be written as a fraction. You should note that the set of rational numbers contains the set of all integers .
The opposite of 15/37 is -(15/37) which is equivalent to (-15)/37 and 15/(-37).

Jan 15, 2014 | Computers & Internet

1 Answer

### I dont know the opposite of a rational number

The opposite of any number (be it integer, rational, or real) is the same number preceded by the negative sign.
Example : the opposite of a is -a (read it a negative a)
opposite of (-b) is -(-b)=b
A rational number is a number that can be written as a fraction. You should note that the set of rational numbers contains the set of all integers .
The opposite of 15/37 is -(15/37) which is equivalent to (-15)/37 and 15/(-37).

Jan 15, 2014 | Computers & Internet

1 Answer

### Is 8/3 a rational number

A rational number is a number that can be expressed as the RATIO (see rational) of two integer (whole) numbers. 8 is an integer, and so is 3. The number 8/3 is a RATIO of two integers :it fits the definition of a rational number.

Oct 29, 2013 | Mathsoft Computers & Internet

1 Answer

### How many rational numbers are there between 10 and -10

There are an infinite number of rational numbers between any two different rational numbers.

Oct 02, 2013 | Google Computers & Internet

1 Answer

### How many rational numbers are between 10 and -10?

There are an infinite number of rational numbers between any two distinct rational numbers.

Oct 02, 2013 | Computers & Internet

1 Answer

### How many rational numbers are between -7 and 1?

There are an infinite number of rational numbers between any two rational numbers.

Given any two rational numbers, the number midway between them is also rational. By the same logic, the number midway between the smaller of the two original numbers and the midpoint is also rational. And so is the number midway between the first number and the second midpoint. And so is the number midway between the first number and third midpoint... and so on.

Sep 06, 2013 | Computers & Internet

1 Answer

### Example of rational and irrational set of numbers chart

You're looking for a website with examples of rational and irrational numbers? Here's an extensive one:
1. Rational: Link
2. Irrational: Link
Or are you just asking for a few examples?
1. Rational: 5, 2/4, -34
2. Irrational: ?2, ?
Hope this helps!

Jun 14, 2011 | Computers & Internet

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