diff --git a/1-js/05-data-types/02-number/article.md b/1-js/05-data-types/02-number/article.md
index ea4a1f3b..98434f14 100644
--- a/1-js/05-data-types/02-number/article.md
+++ b/1-js/05-data-types/02-number/article.md
@@ -4,7 +4,7 @@ In modern JavaScript, there are two types of numbers:
 
 1. Regular numbers in JavaScript are stored in 64-bit format [IEEE-754](https://en.wikipedia.org/wiki/IEEE_754-2008_revision), also known as "double precision floating point numbers". These are numbers that we're using most of the time, and we'll talk about them in this chapter.
 
-2. BigInt numbers, to represent integers of arbitrary length. They are sometimes needed, because a regular number can't safely exceed <code>2<sup>53</sup></code> or be less than <code>-2<sup>53</sup></code>. As bigints are used in few special areas, we devote them a special chapter <info:bigint>.
+2. BigInt numbers represent integers of arbitrary length. They are sometimes needed because a regular number can't safely exceed <code>2<sup>53</sup></code> or be less than <code>-2<sup>53</sup></code>. As bigints are used in few special areas, we devote them a special chapter <info:bigint>.
 
 So here we'll talk about regular numbers. Let's expand our knowledge of them.
 
@@ -308,7 +308,7 @@ They belong to the type `number`, but are not "normal" numbers, so there are spe
     alert( isNaN("str") ); // true
     ```
 
-    But do we need this function? Can't we just use the comparison `=== NaN`? Sorry, but the answer is no. The value `NaN` is unique in that it does not equal anything, including itself:
+    But do we need this function? Can't we just use the comparison `=== NaN`? Unfortunately not. The value `NaN` is unique in that it does not equal anything, including itself:
 
     ```js run
     alert( NaN === NaN ); // false
@@ -402,7 +402,7 @@ A few examples:
     alert( Math.random() ); // ... (any random numbers)
     ```
 
-`Math.max(a, b, c...)` / `Math.min(a, b, c...)`
+`Math.max(a, b, c...)` and `Math.min(a, b, c...)`
 : Returns the greatest/smallest from the arbitrary number of arguments.
 
     ```js run
diff --git a/1-js/05-data-types/04-array/article.md b/1-js/05-data-types/04-array/article.md
index 43d2fd39..4bcab0bc 100644
--- a/1-js/05-data-types/04-array/article.md
+++ b/1-js/05-data-types/04-array/article.md
@@ -96,7 +96,7 @@ The "trailing comma" style makes it easier to insert/remove items, because all l
 
 [recent browser="new"]
 
-Let's say we want a last element of the array.
+Let's say we want the last element of the array.
 
 Some programming languages allow to use negative indexes for the same purpose, like `fruits[-1]`.
 
@@ -403,7 +403,7 @@ It's rarely used, because square brackets `[]` are shorter. Also, there's a tric
 
 If `new Array` is called with a single argument which is a number, then it creates an array *without items, but with the given length*.
 
-Let's see how one can shoot themself in the foot:
+Let's see how one can shoot themselves in the foot:
 
 ```js run
 let arr = new Array(2); // will it create an array of [2] ?