Adding and Subtracting Integers

Hi Ellie,

First I've got three "leesons" I want you to read. Then you'll practice your skills using the online quizzes below.

Integers (les nombres entiers) is a VERY important topic. You're going to use them in every math class from now on. The good news is, you probably already know a lot about them. Living in Winnipeg you know the difference between positive and negative temperatures. If it's -5 degrees celcius outside, how much does the temperature have to go up to get to +5 degrees? If you know the answer to that question (I put it at the end of this blog post) then you know two really important math facts:

(1) -5 and +5 are two completely different numbers and
(2) when you figured out the answer YOU WERE DOING ALGEBRA! (See, I told you you're smart. You can do algebra without even realizing it!)

OK, here are the lessons:

• Inroduction to Integers


• Adding Integers


• Subtracting Integers

The quizzes have 5 questions each. If you refresh the page you'll get a new set of 5 questions, so you can do as many as you like. Also, there is a [Hint] button you can click, if you need it, for each question. Here they are:

• Comparing and Ordering Integers


• Adding Integers


• Subtracting Integers

Let me know how you do with these quizzes. Are they too hard, too easy, too much? (The answer to the question at the top of this post is +10 (positive 10), "positive" because it went up.)