Some schools provide access to the Macmillan/McGraw-Hill online learning platform (e.g., ConnectED). Log in with your school credentials — answer keys are often available there for teachers or parents.
If you post a particular question or a few problems from the workbook (without copying large sections), I can explain the science concept and guide you to the correct answer. Macmillan Science Grade 5 Workbook Answers
When a student finds a wrong answer, turn it into a mini-lesson. turn it into a mini-lesson.