Be aware that some of the assignments will come up as a pdf. When thisis the case, download the assignment so you may then be able to type in the answer. When you are finished save the assignment and then go back to google classroom to upload it. To upload the assignment look to the right hand side and you will see a place that says plus or add, click on this and attach the assignment. Once you are ready hit submit. Please let me know if you have any questions.