Rational Numbers Addition and Subtraction

This video tutorial by the 'profe matemático' covers operations with rational numbers, focusing on addition and subtraction. It explains two scenarios: when denominators are the same and when they differ. The 'carita feliz' method is introduced for handling different denominators. The tutorial includes examples and exercises, demonstrating how to simplify results and apply the method to three rational numbers. The video concludes with additional exercises for viewers to practice.

What are the two possible scenarios when adding or subtracting rational numbers?

• Same denominators and different numerators

• Same numerators and different denominators

• Same numerators and same denominators

• Different numerators and different denominators

If two rational numbers have the same denominator, what should you do with the denominators during addition or subtraction?

• Multiply the denominators

• Subtract the denominators

• Add the denominators

• Keep the denominators the same

What is the simplified result of adding 7/3 and 8/3?

• 3

• 1/3

• 5

• 15/3

What is the result of subtracting 9/7 from 6/7?

• 15/7

• -3/7

• 3/7

• -15/7

What is the first step in the 'happy face' method for adding or subtracting rational numbers with different denominators?

• Add the numerators

• Find a common denominator

• Subtract the denominators

• Multiply the numerators

Using the 'happy face' method, what is the result of adding 3/9 and 2/5?

• 11/15

• 33/45

• 5/45

• 7/15

What is the result of subtracting 2/7 from 3/8 using the 'happy face' method?

• 16/56

• 5/35

• 5/56

• 21/56

How do you handle a negative sign in the 'happy face' method?

• Apply the sign to the numerator

• Multiply the sign with the denominator

• Ignore the sign

• Add the sign to the denominator

What is the least common multiple of 2, 4, and 3?

• 24

• 12

• 8

• 6

What is the result of adding 3/2, 3/4, and 1/3 using the least common multiple method?

• 18/12

• 31/12

• 36/24

• 62/24