Update 1.md

Akuli · Akuli · commit 54c188804b43 · 2016-06-09T09:18:23.000+03:00
diff --git a/1.md b/1.md
@@ -87,7 +87,7 @@ You can also type mathematical statements. Python will compute the result and ec
 >>>
 ```
 
-Also note that the spaces between numbers and operators are not important. They just make the code easier to read when they are used correctly.
+Also note that the spaces between numbers and operators don't affect the evaluation order. They just make the code easier to read when they are used correctly.
 
 ```py
 >>> 14 + 2 + 1
@@ -97,7 +97,7 @@ Also note that the spaces between numbers and operators are not important. They
 >>>
 ```
 
-Calculations are done in the same order as in math. The parenthesis `(` and `)` also work the same way.
+The evaluation order is similar to math. The parenthesis `(` and `)` also work the same way.
 
 ```py
 >>> 1 + 2 * 3        # 2 * 3 is calculated first
@@ -106,7 +106,7 @@ Calculations are done in the same order as in math. The parenthesis `(` and `)`
 9
 >>>
 ```
-Square brackets `[]` and curly brackets `{}` cannot be used instead of parenthesis. Square brackets are for making lists and curly brackets for making sets and dictionaries. Again, all that will be covered later.
+Square brackets `[]` and curly brackets `{}` cannot be used to change the evaluation order. Square brackets are for making lists and curly brackets for making sets and dictionaries. Again, all that will be covered later.
 
 ```py
 >>> [1 + 2] * 3
@@ -118,7 +118,7 @@ TypeError: unsupported operand type(s) for *: 'set' and 'int'
 >>>
 ```
 
-When you get an error message like this one, don't get scared. Read it instead. It tells you what's wrong and where. In this case it says that we are using `*` with a set and an integer, not two integers. We'll learn more about sets later in this tutorial.
+When you get an error message like this one, don't get scared. Read it instead. It tells you what's wrong and where. In this case it says that we are using `*` with a set and an integer, not two integers.
 
 ### More advanced math
 
@@ -163,16 +163,16 @@ This is also useful for converting time from minutes to seconds. 500 seconds is
 `**` can be used to raise to a power, so 3² in math is `3**2` in Python. Powers are calculated before `*` and `/`, but after `()`.
 
 ```py
->>> 3 ** 2
-9
->>> 2 * 3 ** 4      # 3 ** 4 is calculated first
-162
->>> (2 * 3) ** 4    # 2 * 3 is calculated first
-1296
+>>> 2 ** 3
+8
+>>> 2 * 3 ** 2      # 3 ** 2 is calculated first
+18
+>>> (2 * 3) ** 2    # 2 * 3 is calculated first
+36
 >>>
 ```
 
-The `math` module contains more useful things.
+The [math module](https://docs.python.org/3/library/math.html) contains more useful things.
 
 ```py
 >>> from math import pi, sqrt
@@ -192,12 +192,10 @@ Python uses radians instead of degrees, so degrees need to be converted to radia
 >>>
 ```
 
-See the [official documentation of the math module](https://docs.python.org/3/library/math.html) for more info about it.
-
 ### Exercises
 
 1. A company needs to buy new computers and monitors. With taxes, a new monitor costs 49,95 € and a new computer costs 200 €. How much would 100 computers cost without taxes, when the taxes are 24 % of the price?
-2. Taken from [here](http://www.greenteapress.com/thinkpython/html/thinkpython003.html):
+2. Taken from [this book](http://www.greenteapress.com/thinkpython/html/thinkpython003.html):
 
     > The volume of a sphere with radius r is 4/3 π r³. What is the volume of a sphere with radius 5?
 
