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

Learn how to add and subtract negative numbers. The problems ... But when you subtract a negative, this is the same thing as adding the positive. So 2 minus ...

www.khanacademy.org/math/arithmetic/arith-review-negative-numbers/arith-review-add-negatives-intro/e/adding_negative_numbers

Practice adding positive and negative single-digit numbers.

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

Adding Positive Numbers. Adding ... Here is what adding and subtracting positive numbers looks like: ... You can add weights (you are adding negative values).

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

Adding two negative numbers together? ... subtraction; rewrite subtraction as addition; subtraction as addition; negative plus negative; positive; negative ...

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

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! ... Adding Integers ...

www.purplemath.com/modules/negative2.htm

When you'd subtracted a positive number, you'd moved to the left. Now, if you're adding a negative, you can regard this is pretty much the same as when you ...