Find the sum by first finding the equivalent fractions so that both of the fractions have common denominators. one third plus two sixths equals blank

four sixths
four thirds
three sixths
three ninths

Four sixths. You have to make sure the denominators are equal, so since 6 is the greater denominator then that is the denominator we’ll use especially since three is a factor of 6. Multiply the three by 2 to get 6, and then multiply the numerator by the same number, 2, and you’ll get two sixths as your answer. Then, add two sixths plus two sixths to get four sixths which can be simplified to two thirds.

21, i'm pretty sure it's right lol