The Highest Common Factor (HCF) is the largest number that divides into two or more numbers without leaving a remainder. Step 1: Find the factors of 15. Factors of 15 are: 1, 3, 5, 15. Step 2: Find the factors of 20. Factors of 20 are: 1, 2, 4, 5, 10, 20. Step 3: Identify the common factors. The common factors of 15 and 20 are: 1, 5. Step 4: Determine the highest common factor. The highest number among the common factors is 5. The HCF of 15 and 20 is 5.

HCF OF 15 AND 20

July 30, 2026Mathematics

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Answer

The Highest Common Factor (HCF) is the largest number that divides into two or more numbers without leaving a remainder.

Step-by-step solution

4 steps

Find the factors of 15.
Factors of 15 are: 1, 3, 5, 15.
Find the factors of 20.
Factors of 20 are: 1, 2, 4, 5, 10, 20.
Identify the common factors.
The common factors of 15 and 20 are: 1, 5.
Determine the highest common factor.
The highest number among the common factors is 5.

The HCF of 15 and 20 is 5.

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HCF OF 15 AND 20

Answer

Step-by-step solution

Find the factors of 15.

Find the factors of 20.

Identify the common factors.

Determine the highest common factor.

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