Cómo sumar y restar números enteros Metodo 3: ley de los signos
Matemáticas profe Alex
6 min, 9 sec
The video covers the third method for adding and subtracting integers, providing examples and exercises for practice.
Summary
- The instructor introduces the third way to add or subtract integers, building upon two previously explained methods.
- Key concepts include determining the sign of the result by the larger number and understanding whether to add or subtract based on the signs of the integers.
- The instructor works through examples with both positive and negative integers, including single operations and sums involving multiple numbers.
- A technique for summing multiple integers involves separately adding positives and negatives and then combining the results.
- The video concludes with practice exercises for the viewer and a prompt to access the full course on integers.
Chapter 1
Introduction to the course and the third method for adding integers.
- The instructor welcomes viewers to the integer number course.
- Emphasizes that this is the third video and encourages watching previous videos for a better grasp of integer addition concepts.
Chapter 2
In-depth explanation of how to determine the sign and number for the addition of integers.
- An example is provided to explain that every answer must include a sign and a number.
- Clarification that 'larger' refers to the number with the greater absolute value, disregarding the sign.
- The sign of the result corresponds to the sign of the number with the larger absolute value.
- Different signs between numbers mean subtraction, while the same signs mean addition.
Chapter 3
Working through examples where the integers are negative.
- An example with two negative integers illustrates that the answer's sign is negative and that the operation is an addition.
- The sum of 9 and 6 being 15 is provided as the answer for the given example.
Chapter 4
Chapter 5
Demonstration of how to add three integers by breaking down the process into simpler steps.
- The process involves adding two numbers first and then adding the third number to the result.
- Examples show that the sign of the result comes from the number with the larger absolute value.
- Different signs necessitate subtraction, while identical signs mean addition.
Chapter 6
How to sum multiple integers by separately totaling positive and negative numbers.
- A method is detailed for summing multiple integers by first adding all positive and all negative integers separately.
- The instructor provides an example with 15, 3, 7, and 4, demonstrating that the negative sum is 18 and the positive sum is 11.
- The final sum is calculated by subtracting the positive sum from the negative sum, resulting in a negative answer.
Chapter 7
The instructor concludes the lesson by providing practice exercises and additional resources.
- Exercises are offered for the viewer to practice integer addition and subtraction.
- The answers to the exercises are revealed after a countdown.
- The viewers are encouraged to subscribe, comment, share, like the video, and access the full course through the provided links.
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