Knowing Our Numbers

5 Topics | 5 Quizzes
Whole Numbers

5 Topics | 5 Quizzes
Playing With Numbers

10 Topics | 5 Quizzes
Basic Geometrical Ideas

12 Topics | 4 Quizzes
Understanding Elementary Shapes

9 Topics | 5 Quizzes
Fractions

13 Topics | 4 Quizzes
Integers

5 Topics | 5 Quizzes
Decimals

6 Topics | 4 Quizzes
Data Handling

9 Topics | 4 Quizzes
Mensuration

3 Topics | 4 Quizzes
Algebra

10 Topics | 4 Quizzes
Ratio and Proportion

3 Topics | 4 Quizzes
Practical Geometry

5 Topics | 4 Quizzes
Symmetry

8 Topics | 4 Quizzes

Factorisation: A number when expressed as a product of its factors is said to be factorised.

For example: . We say that 12 has been factorised. This is one of the several factorisations of 12.

The others are:

** Prime Factorisation:** It is the ultimate factorisation of a given number. Moreover, it is unique (exactly one).

For example: While factorising 12, we ultimately reach the unique factorisation . In this factorisation, the only factors 2 and 3 are prime numbers. Such a factorisation of a number is called prime factorisation of that number. Thus, 2 × 2 × 3 is the only prime factorisation of 12.

** Factor tree:** When we go on factorizing a number till, we reach its ultimate factorisation and write the process as follows, we get the shape of a tree called Factor tree.

For example: Let us factorize 90. Let us see below:

Thus.

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