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
__Highest Common Factor (HCF)__

The Highest Common Factor (HCF) of two or more given numbers is the highest (or greatest) of their common factors. It is also known as the Greatest Common Divisor (GCD).

For example: Consider two numbers 12 and 20. Factors of 12 are 1, 2, 3, 4, 6 and 12. Factors of 20 are 1, 2, 4, 5, 10 and 20.

The common factors of 12 and 20 are 1, 2 and 4. The highest of these is 4. So, 4 is the HGF of 12 and 20.

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