Question

Todd wants to know how many numbers between 1 and 50 have only 2 and 5 as prime factors. list all the numbers that have only 2 and 5 as prime factors. Explain how you found your answer.

Answer 1

10,20,30,40 both are divisible on these numbers

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47. both are not divisable

you know this because if you do prime factorization both 2 and 5 are prime numbers found in those numbers.

Explanation:

Answer 2

Answer: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47.

Explanation: