What is the HCF of 20, 25 and 30?
The highest common factor of 20, 25 and 30 is the largest possible number which divides 20, 25, and 30 completely leaving no remainder.
Answer: HCF of 20, 25 and 30 is 5.
Let's find the HCF of 20, 25 and 30 by two methods.
Explanation
Method 1: HCF of 20, 25 and 30 by Prime Factorisation Method
 Prime Factorisation of 25: 5 × 5
 Prime Factorisation of 30 : 2 × 3 × 5
 Prime Factorisation of 20: 2 × 2 × 5
The common factor of 20, 25 and 30 in the prime factorization of 20, 25 and 30 is 5.
Hence, the HCF of 20, 25 and 30 is 5
Method 2: HCF of 20, 25 and 30 by Long Division
Follow the steps mentioned below to find the HCF of 20, 25 and 30 by long division:

Step 1: First take the greater number 30 as a dividend and the smaller number 20 as the divisor, to get the common factor 10.

Step 2: Now take the last number 25 as dividend and 10 as the divisor.

Step 3: Continue till you get the remainder as 0 and HCF of 20, 25, and 30 is 5, that is, the last divisor obtained.
Hence, HCF of 20, 25 and 30 is 5.
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