Course 2: Lesson 1C: Coordinate PlaneRemember today we plotted points on a coordinate plane.
We always write a point with like this: (x-coordinate, y-coordinate).
The coordinate plane is broken up into 4 quadrants and they are labeled as follows:
Here is a Khan Academy video about our lesson today.
Try this Khan academy activity to practice plotting points and naming quadrants. Click here.
Pre-Algebra: Lesson 2-2: Adding IntegersRemember our song/poem for adding integers:
"Same signs add and keep,
Different signs subtract,
Keep the sign of the higher number,
Then it will be exact."
Here's another way of writing the Rules:
When the integers have the SAME signs:
1. Add the numbers together.
2. Keep the same sign.
When the integers have DIFFERENT signs.
1. Ignore the signs.
2. Subtract the 2 numbers.
3. Give the answer the sign of the larger number (number with greater absolute value).
Here's a Khan Academy video explaining this concept: