Answer: 1/3
Step-by-step explanation: To write the fraction 15/45 in lowest terms, we divide the numerator and the denominator by the greatest common factor of 15 and 45.
Factors of 15 ⇒ 1, 3, 5, 15
Factors of 45 ⇒ 1, 3, 9, 15, 45
Since the greatest common factor of 15 and 45 is 15, we will divide the numerator and the denominator of 15/45 by 15.
Image provided.
Therefore, 15/45 written in lowest terms is 1/3.