# Maths Rational Numbers part 13 (Addition of Rational Numbers) CBSE Class 7 Mathematics VII | Summary and Q&A

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November 13, 2016
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LearnoHub - Class 11, 12
Maths Rational Numbers part 13 (Addition of Rational Numbers) CBSE Class 7 Mathematics VII

## TL;DR

This video explains how to perform addition and subtraction operations on rational numbers, including the concept of finding a common denominator.

## Key Insights

• 🗂️ Rational numbers can be added, subtracted, multiplied, and divided using specific rules depending on their denominators.
• 🪜 Addition of rational numbers with the same denominator is as simple as adding the numerators.
• 🪜 Adding rational numbers with different denominators involves finding the least common multiple (LCM) and converting the fractions to a common denominator.
• #️⃣ Subtracting rational numbers is done by moving left on the number line.
• #️⃣ The process of adding positive and negative rational numbers on the number line depends on the direction of the jump.
• 🪜 Understanding the concept of finding a common denominator is essential for adding or subtracting rational numbers with different denominators.
• #️⃣ Rational numbers can be represented on the number line to visualize addition and subtraction operations.

## Transcript

hello friends this video on rational numbers by 13 is brought to you by exam for calm no more fear from exam so now that we have discussed all the basic stuff about rational numbers it is time to perform some operations on rational numbers when we talk about operations we will perform the basic operations like addition subtraction multiplication an... Read More

### Q: How do you add rational numbers with the same denominator?

Adding rational numbers with the same denominator is as simple as adding their respective numerators and keeping the denominator unchanged.

### Q: What is the concept of finding a common denominator in adding rational numbers with different denominators?

Finding a common denominator involves determining the least common multiple (LCM) of the denominators and converting the fractions to have the same denominator before adding the numerators.

### Q: What is the process of subtracting rational numbers on the number line?

Subtracting a rational number involves moving left on the number line. The number of jumps is determined by the absolute value of the negative number being subtracted.

### Q: How do you add positive and negative rational numbers?

When adding positive and negative rational numbers, you move towards the right on the number line when adding a positive number and towards the left when adding a negative number.

## Summary & Key Takeaways

• The video discusses the basic operations of addition, subtraction, multiplication, and division on rational numbers.

• Addition of rational numbers with the same denominator is done by simply adding the numerators.

• Addition of rational numbers with different denominators involves finding the least common multiple (LCM) and converting the fractions to a common denominator.