Homeschool Buyers Co-op is running a 40% off sale for the large Math Mammoth bundles. The offer expires 8/31/2020.

^

# Review of adding integers: counters, number line, different signs, rules - video lesson

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

Back to the integer videos index

Back to all videos index

WAIT!

Receive my monthly collection of math tips & resources directly in your inbox — and get a FREE Math Mammoth book!

You can unsubscribe at any time.

### Math Mammoth Tour

Confused 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)

### "Mini" Math Teaching Course

This 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
- Troubles with word problems
- Teaching multiplication tables
- Why fractions are so difficult
- The value of mistakes
- Should you use timed tests
- And more!

A GIFT of over 400 free worksheets and sample pages from my books right in the very beginning. A monthly collection of math teaching tips & Math Mammoth updates (unsubscribe any time)