Adding and Subtracting Positive and Negative Numbers and Stories

When kids are tasked with having to add and subtract negative numbers, the easiest way to teach this is to pull out a numberline. Although a line has arrows at the ends and never ends, notice how teachers always tell students to, "Get in a line!" I was a weird teacher because I told mine to get into a line segment or make two parallel line segments. Sometimes when we were waiting outside the bathroom, I asked the kids to make perpendicular lines, or I'd ask them to count off using prime numbers. That was always fun! But back to the old number line.

The number line above goes in both directions, as a middle school number line should, so when you go to solve a problem, you simply count in the direction of the number's sign. Ie., if there is not a negative sign in front of it, you will head right or in the positive direction. If the number is negative move to the left.

 -10 + 5 = -5

A number line makes teaching this concept so much easier than trying to teach without one.

But, what if kids are tasked with adding numbers such as:

- 4 + 8 =

To solve this problem, I tell kids to use the commutative property of addition.

-4 + 8 = 8 + -4 = 8 - 4

You can turn this problem into a first grade problem!

If you are interested in a resource for teaching middle school math, check this out!

Positive and Negative Integer Operations with Word Problems

Tune in next week for tips on how to teach minus a negative number.

Monday Music Moves Me

This week is all about songs that tell stories, so here is the ultimate classic in that department.

American Pie, by Don McLean

This musical number tells a farewell story to the 50s and 60s and how music died with the plane crash that killed Ritchie Valens, Buddy Holly, and the Big Bopper. The music is filled with hidden messages involving the Vietnam War and Jackie Kennedy, "the widowed bride" in some accounts, while others believe the song is referring to Buddy Holly's pregnant wife who miscarried. One could spend the year analyzing the story of American Pie, but I'd rather just listen to it.

Next up is Paul Simon with Me and Julio Down at the School Yard.

This is the story of a couple of kids in trouble for the unknown actions down at the school yard. Simon purposely kept the actions vague; but whatever it was, Mama and Papa didn't like it!

This last song is one I had to post because I believe history has gotten it all wrong with blaming poor Mrs. O'Leary and her cow for the Chicago Fire of 1871. I've written a different version of this story that you can purchase at my TpT Store.

The Chicago Fire Reading Passage