Question

Please help tommy go figure he is trying to add fractions and here is what he did 3/10 + 4/5 =7/15.

his teacher say that his answer is wrong In detail, explain to tommy what he did wrong​

Answer 1

Tommy made a mistake in the concept of adding these fractions. He added the numerators together, resulting in 7. He then added the denominators, resulting in 15. His result is 7/15, which is wrong.

What you are supposed to do is find the least common denominator (LCD) of the two fractions. Of 3/10 and 4/5, the LCD is 10. 3/10 + 8/10 (8/10 is the same as 4/5) = 11/10 or 1 1/10