Subtracting negative numbers intro | |
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Description | |
Exercise Name: | Subtracting negative numbers intro |
Math Missions: | Arithmetic essentials Math Mission, 7th grade (U.S.) Math Mission, Pre-algebra Math Mission, Algebra basics Math Mission, Mathematics I Math Mission |
Types of Problems: | 1 |
The Subtracting negative numbers intro exercise appears under the Arithmetic essentials Math Mission, 7th grade (U.S.) Math Mission, Pre-algebra Math Mission, Algebra basics Math Mission and Mathematics I Math Mission. This exercise practices subtracting on integers.
Types of Problems
There is one type of problem in this exercise:
- Find 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.
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).
- To add two negatives find the sum of the magnitudes of the numbers and place a negative sign in front of it.
- 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.
- Subtracting a negative is equivalent to adding.
- 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.
Real-life Applications
- Negative numbers are used to represent land below sea level.
- Negative numbers are used to describe values on a scale that goes below zero, such as the Celsius and Fahrenheit scales for temperature.