docs(elementary): correct grammar

subjects/elementary/README.md

@@ -2,17 +2,15 @@
 
 ### Instructions
 
-Create 3 functions:
+Create 3 functions which each take `(a, b)` as arguments:
 
-- `multiply` that act like the `*` operator without using it
-- `divide` that do an integer division without using `/`
-- `modulo` that act like the `%` operator without using it
-
-> functions should have (a, b) as arguments
+- `multiply` that acts like the `*` operator, without using it.
+- `divide` that acts like the integer division operator `/`, without using it.
+- `modulo` that acts like the `%` operator, without using it.
 
 ### Code provided
 
-> all code provided will be added to your solution and doesn't need to be submited.
+> The provided code will be added to your solution, and does not need to be submitted.
 
 ```js
 Math.imul = undefined