Final answer:
The least common multiple of 7 and 9 is 63. Option (D) is correct.
Step-by-step explanation:
The least common multiple (LCM) is the smallest number that two or more numbers can divide into evenly. To find the LCM, you can use the prime factorization method or list the multiples of each number.
LCM is also used to add or subtract any two fractions when the denominators of the fractions are different. While performing any arithmetic operations such as addition, and subtraction with fractions, LCM is used to make the denominators common. This process makes the simplification process easier.
The least common multiple (LCM) of two numbers is the smallest number that is divisible by both numbers. To find the LCM of 7 and 9, we can list the multiples of each number until we find a common multiple:
Multiples of 7: 7, 14, 21, 28, 35, 42, 49, ...
Multiples of 9: 9, 18, 27, 36, 45, 54, 63, ...
The least common multiple of 7 and 9 is 63, so the correct answer is d.