The document RD Sharma Solutions - Ex-5.2, Operations On Rational Numbers, Class 7, Math Class 7 Notes | EduRev is a part of the Class 7 Course RD Sharma Solutions for Class 7 Mathematics.

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**Q1. Subtract the first rational number from the second in each of the following:**

**Solution. **

**Q2. Evaluate each of the following:**

**Solution. **

LCM of 3 and 5 is 15

LCM of 3 and 7 is 21

**Q3. The sum of the two numbers is 5/9. If one of the numbers is 1/3, find the other.**

**Solution. **

Required number =

LCM of 3 and 9 is 9

Therefore required number

= 2/9

**Q4. The sum of two numbers is −1/3. If one of the numbers is −12/3, find the other.**

**Solution.**

Let the required number be x

The required number is 11/3

**Q5. The sum of two numbers is −4/3. If one of the numbers is -5, find the other.**

**Solution.**

Let the required number be x

The required number is 11/3

**Q6. The sum of two rational numbers is -8. If one of the numbers is −15/7, find the other.**

**Solution.**

Let the required number be x

The required number is -41/7

**Q7. What should be added to −7/8 so as to get 5/9?**

**Solution.**

Let the required number be x

The required number is 103/72

**Q8. What number should be added to -5/11 so as to get 26/33?**

**Solution.**

Let the required number be x

The required number is 41/33

**Q9. What number should be added to −5/7 to get −2/3?**

**Solution.**

The required number is 1/21

**Q10. What number should be subtracted from −5/3 to get 5/6?**

**Solution.**

Let the required number be x

The required number is 15/6

**Q11. What number should be subtracted from 3/7 to get 5/4?**

**Solution.**

Let the required number be x

The required number is 23/28

**Q12. What should be added to **

**Solution.**

Let the required number be x

The required number is −7/5

**Q13. What should be added to **

**Solution.**

Let the required number be x

The required number is 59/30

**Q14. What should be subtracted from **

**Solution.**

Let the required number be x

The required number is 1/4

**Q15. Simplify:**

**Solution.**

**Q16. Fill in the blanks:**

**Solution.**

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