Chapter 5 Operations on Rational Numbers Set 5.1
Question 1.
Carry out the following additions of rational numbers:
ii. 12/3 +24/5
iii. 11/17 + 13/19
iv. 23/11 + 13/77
Question 2.
Carry out the following subtractions involving rational numbers.
ii. 13/36 – 2/40
iii. 12/3 – 35/6
iv. 41/2 – 31/3
Question 3.
Multiply the following rational numbers.
Question 4.
Write the multiplicative inverse of.
Question 5.
Carry out the divisions of rational numbers:
Intext Questions and Activities
Question 1.
Complete the table given below. (Textbook pg. no. 34)
3  3/5  17  5/11  5  
Natural Numbers  x  ✓  
Integers  ✓  
Rational Numbers  ✓ 
Solution:
3  3/5  17  5/11  5  
Natural Numbers  x  x  x  x  ✓ 
Integers  ✓  x  ✓  x  ✓ 
Rational Numbers  ✓  ✓  ✓  ✓  ✓ 
Question 2.
Discuss the characteristics of various groups of numbers in class and complete the table below. In front of each group, write the inference you make after carrying out the operations of addition, subtraction, multiplication and division, using a (✓) or a (x).
Remember that you cannot divide by zero. (Textbook pg. no. 35)
Group of Numbers  Addition  Subtraction  Multiplication  Division 
Natural Numbers  ✓ 
x
 ✓ 
x

Integers  
Rational Numbers 
Solution:
Group of Numbers  Addition  Subtraction  Multiplication  Division 
Natural Numbers  ✓ 
x
 ✓ 
x

Integers  ✓  ✓  ✓ 
x

Rational Numbers  ✓  ✓  ✓  ✓ 