Shannon states that 2/3 + 2/7 = 20/21

Question

What equivalent fractions did Shannon use to solve the problem since the denominators are not the same?

Answer 1

To add 2/3 and 2/7, Shannon likely found equivalent fractions with the same denominator. One way to do this is to multiply the numerator and denominator of 2/3 by 7 and the numerator and denominator of 2/7 by 3. This gives us 14/21 + 6/21, which equals 20/21.