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- Playing with numbers Exercise 2.1
- Playing with numbers Exercise 2.8
- Playing with numbers Exercise 2.2
- Playing with numbers Exercise 2.3
- Playing with numbers Exercise 2.4
- Playing with numbers Exercise 2.5
- Playing with numbers Exercise 2.6
- Playing with numbers Exercise 2.7
- Playing with numbers Exercise 2.9
- Playing with numbers Exercise 2.10
- Playing with numbers Exercise 2.11

- Knowing your numbers
- Playing with numbers
- Whole Numbers
- Operations on whole numbers
- Negative number and integers
- Fractions
- Decimals
- Introduction to Algebra
- Ratio, Proportion and Unitary Method
- Basic Geometrical Concepts
- Angles
- Triangles
- Circles
- Pair of Lines and Transversal
- Understanding Three Dimensional Shapes
- Symmetry
- Basic Geometrical Tools
- Geometrical Constructions
- Mensuration
- Data Handling Presentation Of Data
- Data Handling – II
- Data Handling Bar Graphs

A list consists of the following pairs of numbers:

(i)51, 53; 55, 57; 59, 61; 63, 65; 67, 69; 71, 73

Categorize them as pairs of

(i)co-primes

(ii)primes

(iii)composites

Answer:

(i)Two numbers are said to be co-prime if they do not have a common factor other than 1.

Therefore, all the given pairs of numbers are co-primes.

(ii)A number is called a prime number if it has no factor other than 1 and the number itself.

Therefore, 59, 61; 71, 73 are pairs of prime numbers.

(iii)A number is called a composite number if it has at least one factor other than 1 and the number itself.

Therefore, 55, 57; 63, 65 are pairs of composite numbers.

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