Factor the following number to it's prime factor:

40

http://www.mathsisfun.com/prime-factorization.html

2 * 20
2 * 5 * 4

To factorize the number 40 into its prime factors, we need to find the prime numbers that can divide evenly into 40.

1. Start by dividing the number by the smallest prime number, which is 2.
2. Divide 40 by 2: 40 ÷ 2 = 20.
3. Now divide the quotient, 20, by 2 again: 20 ÷ 2 = 10.
4. Continue dividing the resulting quotient by 2 until you can no longer divide evenly. In this case, we can divide 10 by 2 one more time: 10 ÷ 2 = 5.
5. Now, we have reached a prime number (5). Since we cannot divide it any further, we stop here.

The prime factorization of 40 is: 2 × 2 × 2 × 5 = 2^3 × 5.

So, the prime factors of 40 are 2, 2, 2, and 5.