why 21.57 is a rational number, or why it is not a rational number.
A rational number is a number that can be expressed as a fraction where the numerator is a whole number (integer) and the denominator is a whole number (integer).
21.57 is the same as 21.57 over 1. In other words, 21.57 can be written with a numerator and denominator, like this:
21.57
21.57 = -----------
1
You can multiply the numerator and denominator of any fraction by the same number and keep the value of the fraction the same. Here we will multiply the numerator and denominator by 100 to get rid of the decimal point.
21.57 × 100
----------------
1 × 100
When we calculate the numerator and the denominator above, we get this fraction:
2157
---------
100
The fraction above is the same as 21.57. Furthermore, the numerator and the denominator of the fraction above are integers. Therefore, we can conclude that the answer to "Is 21.57 a rational number?" is yes.
Answers & Comments
Answer:
Rational
Step-by-step explanation:
Answer:
Rational
Step-by-step explanation:
why 21.57 is a rational number, or why it is not a rational number.
A rational number is a number that can be expressed as a fraction where the numerator is a whole number (integer) and the denominator is a whole number (integer).
21.57 is the same as 21.57 over 1. In other words, 21.57 can be written with a numerator and denominator, like this:
21.57
21.57 = -----------
1
You can multiply the numerator and denominator of any fraction by the same number and keep the value of the fraction the same. Here we will multiply the numerator and denominator by 100 to get rid of the decimal point.
21.57 × 100
----------------
1 × 100
When we calculate the numerator and the denominator above, we get this fraction:
2157
---------
100
The fraction above is the same as 21.57. Furthermore, the numerator and the denominator of the fraction above are integers. Therefore, we can conclude that the answer to "Is 21.57 a rational number?" is yes.