irrational number
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
A number that cannot be written as a simple fraction of two whole numbers, and whose decimal form never repeats or ends.
Synonyms and antonyms
Antonyms
rational number
Test yourself
Which word fits the gap? "Pi and the square root of two are both well-known _____."
Answer: irrational number
In your own words, what does "irrational number" mean?
A number that cannot be written as a simple fraction of two whole numbers, and whose decimal form never repeats or ends.
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