Fix typo

Thanks Duncan Macmillan!

basics.md

@@ -41,7 +41,7 @@ It is called a literal because it is _literal_ - you use its value literally. Th
 
 Numbers are mainly of two types - integers and floats.
 
-An examples of an integer is `2` which is just a whole number.
+An example of an integer is `2` which is just a whole number.
 
 Examples of floating point numbers (or _floats_ for short) are `3.23` and `52.3E-4`. The `E` notation indicates powers of 10. In this case, `52.3E-4` means `52.3 * 10^-4^`.