What is the GCF of 18 and 81?
Greatest common factor or highest common factor is the largest number that divides the two given numbers.
Answer: The GCF of 18 and 81 is 9
Let us see how to find the GCF of 18 and 81
We will be finding the prime factors of 18 and 81
GCF will be the product of all the common prime factors of 18 and 81
GCF(18,81) = 3 × 3 = 9
Let's look into the long division method to calculate the GCF
- Divide the larger number by the smaller number.
- Now divide the divisor by the remainder.
- Repeat the process of dividing the preceding number by the remainder last until 0 zero is obtained as remainder.
- The last divisor is called GCF
Thus, the GCF of 18 and 81 will be 9