Addition and Subtraction
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Lesson Description:
Addition and subtraction on a number line, evaluating expressions using order of operations, and writing word statements for expressions and vice versa.
Created by and copyright of Larry Perez. Funded by the state of California through Saddleback College. More information on videos, resources, and lessons at Algebra2Go.
Questions answered by this video:
- How do you add and subtract positive and negative integers using a number line?
- How is subtracting like adding a negative?
- How is -4 - 5 the same as -4 + -5?
- How do you subtract a negative number on a number line?
- How do you subtract -4 - (-5)?
- How do you simplify -4 + (5 - 17)?
- How do you simplify -7 - |-5 - 3|?
- How do you simplify -6 - [-4 + (-5)]?
- How do you write word statements for mathematical expressions?
- What are some word statements you can write for -6 + 9?
- What are some word statements you can write for 5 - 12?
- How do you write mathematical expressions for word statements?
- How do you write fifteen more than the difference of negative six and nine as a mathematical expression?
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Staff Review
This is a great addition / subtraction review shown using a number line, which helps explain how to add and subtract numbers, especially when the numbers are negative. This is a very good tutorial for learning about or reviewing addition and subtraction of integers. As the lesson goes on, more and more complicated expressions are shown and order of operations is used to simplify the expressions. Finally, word statements are written from mathematical expressions.
