Subtracting negative numbers intro

The topic  appears under the 7th Grade Math Mission. This exercise practices adding and subtracting on integers.

Types of Problems
There is one type of problem in this exercise:


 * 1) Find the sum of the difference: This problem provides two numbers. The student is asked to find the sum of the numbers and write it in the space provided.Aasnn1.png

Strategies
Knowledge of arithmetic operations on integers can assist on this problem, as would a model for operations on integers (such as a number line model).
 * 1) To add two negatives find the sum of the magnitudes of the numbers and place a negative sign in front of it.
 * 2) To add a negative and a positive number, find the difference of the magnitudes of the numbers and "keep the bigger sign." For example, if the negative number was larger in magnitude, the net will be negative.
 * 3) Subtracting a negative is equivalent to adding.
 * 4) A number line model can be used by thinking of a person standing at zero and looking in the positive direction. Add means to walk forward, subtract means to walk backwards, and a negative sign means to face the other direction.