19.
Mallary incorrectly adds the fractions 13, 14, and 712.
She said that to add fractions with different denominators, you use the common denominator and add the numerators. Mallary’s work is shown.
13+14+712
'
1+1+712
912
● What is Mallary’s mistake?
● Find the correct value of 13+14+712
● Show your work or explain your answer.
Enter your answers and your work or explanation in the box provided.