My boy in third grade did a math test, measuring a line segment to the nearest 1/2 inch. There were 2 of this question and one is exactly 2 3/4 inches long, other is 2.5 inches. His answer was 2 and 1/2 inch for both questions but he didn't get credit because The teacher said that the answer was 3 inches based on the book. After I questioned her for me to understanding the right answer, she gave 1 credit to him. She said the right answer for the nearest half inch of 2 3/4 inch should 3 inches.
My husband think that is round up. For nearest 1/2 inch, both answer 2 1/2 and 3 are right.
what do you think?
i know in school teaches him that nearest ten of 15 would be 20.