Question

The sum of prime factors of 63
A.14
B.10
C.8
D.4

Answer 1

Hint: Firstly calculate the factor of 63 and then calculate prime factor of 63 and thus the sum of prime factors will be our required answer. "Prime Factorization" is finding which prime numbers multiply together to make the original number.

Complete step-by-step answer:
Factors of 63 are 1,3,7,9,21,63
And so prime factor of 63 are 3,7
To select the prime factors , we just need to select the prime numbers among all the factors of the numbers.
Thus, our required answer is
$$\begin{gathered} \Rightarrow 3+7 \\ \Rightarrow 10 \end{gathered}$$
Hence , option (b) is our required correct answer.

Note: A factor is one of two or more numbers that divides a given number without a remainder. Multiples and factors are best explained by using a number sentence such as the following: This number sentence tells us that 20 is a multiple of 5 and is also a multiple of 4. It also tells us that 5 and 4 are factors of 20.
Prime factor is the factor of the given number which is a prime number. Factors are the numbers you multiply together to get another number.