Answer: Factors of 90 are 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90. There are 12 integers that are factors of 90. The greatest factor of 90 is 90. 3.

Table of Factors and Multiples

Step 1: Start by dividing the number by the first prime number 2 and continue dividing by 2 until you get a decimal or remainder. Then divide by 3, 5, 7, etc. until the only numbers left are prime numbers. Step 2: Write the number as a product of prime numbers.

So, the prime factorization of 7429 can be written as 171 × 191 × 231 where 17, 19, 23 are prime.

Since 5 is an odd prime number, it cannot be further divided. Therefore the prime factorization of 90 is 90 =3 × 3 × 5 × 2.

Factors of 80 by Prime Factorization The factors of 80 by the prime factorization method are 1, 2, 5, 10, 20, 40, and 80. Here, 2 and 5 are the prime factors of 80.

For example, the HCF of 2 and 4 is 2, because 2 is the number which is common to both 2 and 4.

The greatest common factor of 12 and 36 is 12.

9

The HCF of 18 and 30 is equal to. >The HCF of 18 and 30 is equ…

Least common multiple (LCM) of 18 and 30 is 90.

The LCM of 15,30,18 15 , 30 , 18 is the result of multiplying all prime factors the greatest number of times they occur in either number. The LCM of 15,30,18 15 , 30 , 18 is 2⋅3⋅3⋅5=90 2 ⋅ 3 ⋅ 3 ⋅ 5 = 90 .

180

120

Hence, The common factors of 15 and 25 are 5 and 1.

Answer: GCF of 15 and 25 is 5.