Factor:
A factor is a number that divides another number, leaving no remainder. In other words, if multiplying two whole numbers gives us a product, then the numbers we are multiplying are factors of the product because they are divisible by the product. There are two methods of finding factors: multiplication and division.
Multiple:
multiple in math are the numbers you get when you multiply a certain number by an integer. For example, multiples of 5 are: 10, 15, 20, 25, 30…etc. Multiples of 7 are: 14, 21, 28, 35, 42, 49…etc.
How to find hcf of two or more numbers :
Steps 1:
Find all the factors of each given number.
Step 2:
Find common factors of the given number.
Step 3:
The greatest of all the factors obtained in Step 2, is the required highest common factor (H.C.F).
I'm only writing the answers below as I already told how to find it.
Highest common factor:
1. The factors of 18 are: 1, 2, 3, 6, 9, 18
The factors of 20 are: 1, 2, 4, 5, 10, 20
Then the greatest common factor is 2.
2. The factors of 15 are: 1, 3, 5, 15
The factors of 15 are: 1, 3, 5, 15The factors of 20 are: 1, 2, 4, 5, 10, 20
The factors of 15 are: 1, 3, 5, 15The factors of 20 are: 1, 2, 4, 5, 10, 20Then the greatest common factor is 5.
3. 8
4. 12
5. 10
6. 14
How to find lcm. of numbers :
Step 1: Find the prime factors of the given numbers by repeated division method.
Step 2: Write the numbers in their exponent form. Find the product of only those prime factors that have the highest power.
Step 3: The product of these factors with the highest powers is the LCM of the given numbers.
I'm only writing the answers below as I already told how to find it.
Lowest common multiple :
1. 42
2. 12
3. 40
4. 20
5. 80
6. 42
hope it helps you..