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Add & Subtract with Negative Numbers
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What you will learn from this videoWhat you will learn
- We’ll learn how to add with negative numbers.
- We’ll also learn how to subtract with negative numbers.
- And we'll see how this knowledge can use help us go scuba diving, prepare for bad weather, and go on an epic hike!
- Discussion Questions
Before Video
How do you set up a number line to represent positive and negative numbers?ANSWERYou can create a vertical number line or a horizontal number line. A vertical line has 0 in the middle, the positive numbers are above 0, and the negative numbers are below 0. A horizontal number line has 0 in the middle with the positive numbers to the right of 0 and the negative numbers to the left of 0.
9 units above 0.
12 units below 0.
6 units to the right of 0.
9 units to the left of 0.
After Video
Give students the problem 5 + 7 and have them show the solution on the number line.ANSWERA number line shows that the solution to 5 + 7 is 12. Start at 5 and jump 7 units to the right, to 12.
A number line shows that the solution to –5 + (–8) is –13. Start at –5 and jump 8 units to the left, to –13.
A number line shows that the solution to +3 – 7 is –4. Start at 3 and jump 7 units to the left, to –4.
A number line shows that the solution to –4 + (–3) is –7. Start at –4 and jump 3 units to the left, to –7.
A number line shows that the solution to 4 – (–5) is 9. Start at 4 and jump 5 units to the right, to 9.
- Vocabulary
- Negative numbers DEFINE
The numbers to the left of 0 on a number line.
- Positive numbers DEFINE
The numbers to the right of 0 on a number line.
- Number line DEFINE
A line on which numbers are marked in order and at equal intervals.
- Integers DEFINE
Zero, all the whole numbers, and their opposites.
- Sign DEFINE
Identifies a number as positive or negative.
- Operation DEFINE
The four operations are addition, subtraction, multiplication, and division.
- Negative numbers DEFINE
- Reading Material
- Practice Word Problems
- Practice Number Problems
- Lesson Plan
- Teacher Guide