Answer:
Calculation is explained as if a number is divisible by both 7 and 9, it will also be divisible by 1, 3, 7, 9, 21, 63.
Step-by-step explanation:
If a number is divisible by both 7 and 9, then it will also be divisible by their common multiples. The common multiples of 7 and 9 are their least common multiple (LCM) and its factors.
To find the LCM of 7 and 9, we can list their multiples:
Multiples of 7: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, ...
Multiples of 9: 9, 18, 27, 36, 45, 54, 63, 72, 81, 90, ...
From the list, we see that 63 is the first number that appears as a multiple of both 7 and 9. Therefore, any number divisible by both 7 and 9 will also be divisible by 63.
Other two numbers by which the number will be divisible are the factors of 63. The factors of 63 are 1, 3, 7, 9, 21, and 63.
So, if a number is divisible by both 7 and 9, it will also be divisible by 1, 3, 7, 9, 21, 63.