www.wyzant.com/resources/lessons/math/elementary_math/positive_and_negative_numbers/adding_positive_and_negative_numbers

**Adding positive** numbers to **negative numbers** can get tricky, because you need
to pay close attention to where the negative signs are placed in the problem.

www.khanacademy.org/math/arithmetic/arith-review-negative-numbers/arith-review-sub-neg-intro/v/adding-and-subtracting-negative-number-examples

Think of **adding negative numbers** as **adding** normal numbers, just with a
negative sign. You **add** them the same way you would with **positive** numbers, you
just ...

www.mathsisfun.com/positive-negative-integers.html

The last two examples showed us that taking away balloons (subtracting a
**positive**) or **adding** weights (**adding** a **negative**) both make the basket go down.

www.thoughtco.com/cheat-sheet-positive-negative-numbers-2312519

Sep 20, 2017 **...** Learn about the rules of **positive and negative** integers. ... Remember that **adding**
a **negative number** is the same as subtracting a **positive** one.

virtualnerd.com/middle-math/integers-coordinate-plane/add-integers/add-negative-and-positive-number

Note: How do you combine a **positive** and a **negative number**? This tutorial
shows you how. You even get to see it explained with a number line!

virtualnerd.com/pre-algebra/algebra-tools/add-subtract-integers/add-integers/negative-number-addition

Just **add** the absolute value of each number together, put a negative sign in front,
... **Positive and negative numbers** (and zero!) are the building blocks of math.