This is a review lesson on integer addition for pre-algebra or 7th grade math.
First I briefly show the basics of integer addition using counters and number line.
Then we solve sums with more than two integers to add, starting with additions of several negative integers, and then proceeding to sums that include several negative and positive integers. The basic idea is to first add all the negatives and all the positives separately, and lastly add those two sums.
I also explain the common rules for integer addition. When the two integers have different signs, you subtract their absolute values, then check which "side wins" so to speak (which integer has larger absolute value), and the sum has the same sign as that integer.
Tengo una versión español de este video también.
Subtraction of integers — a video lesson
Math Mammoth Integers — a self-teaching worktext with explanations & exercises for all operations with integers
Math Mammoth Grade 7 complete curriculum
Math Mammoth TourConfused about the different options? Take a virtual email tour around Math Mammoth! You'll receive: An initial email to download your GIFT of over 400 free worksheets and sample pages from my books. Six other "TOURSTOP" emails that explain the important things and commonly asked questions concerning Math Mammoth curriculum. (Find out the differences between all these different-colored series!)This way, you'll have time to digest the information over one or two weeks, plus an opportunity to ask me personally about the curriculum. A monthly collection of math teaching tips & Math Mammoth updates (unsubscribe any time) We respect your email privacy.
Note: You will FIRST get an email that asks you to confirm your email address. If you cannot find this confirmation email, please check your SPAM/JUNK folder. |
"Mini" Math Teaching CourseThis is a little "virtual" 2-week course, where you will receive emails on important topics on teaching math, including:
- How to help a student who is behind You will also receive: A GIFT of over 400 free worksheets and sample pages from my books right in the very beginning.![]() We respect your email privacy.
Note: You will FIRST get an email that asks you to confirm your email address. If you cannot find this confirmation email, please check your SPAM/JUNK folder. |
Maria's Math TipsEnter your email to receive math teaching tips, resources, Math Mammoth news & sales, humor, and more! I tend to send out these tips about once monthly, near the beginning of the month, but occasionally you may hear from me twice per month (and sometimes less often). Peek at the previous tips here. You will also receive:
We respect your email privacy.
|