The antonyms for the word "did addition" are "subtracted," "reduced," "took away," "decreased," "subtracted from," "lessened," "diminished," "minimized," "took from," and "detracted." These words imply that the original amount is decreasing in some way, either by removing a portion of it or reducing its value. While "did addition" is usually associated with math problems and increasing values, these antonyms have the opposite effect. By understanding these antonyms, students can better understand the concept of subtraction and develop a more comprehensive knowledge of basic math skills.