What is the common denominator of 3/5 and 1/3? Algebra Properties of Real Numbers Addition of Rational Numbers 1 Answer Hope It Helps Apr 1, 2018 A common denominator of #3/5# and #1/3# is #15# Explanation: #5*3=15# #15/5=3# #15/3=5# Answer link Related questions How do you add rational numbers? How do you write fractions with a common denominator? How do you write mixed fractions into improper fractions? How do you write #11 2/3# into an improper fraction? How do you add #4 1/7 + 2/7#? How do you add #3/5+2/8#? How do you change fractions into decimals? How do you find the sum of #2.5+2.57+3.1#? How do you calculate #18/12 - 7/9#? How do you write 5 into an improper fraction? See all questions in Addition of Rational Numbers Impact of this question 7887 views around the world You can reuse this answer Creative Commons License