Create a free account and create sets of flashcards to share with your class. Or let the class make flashcards to share. You can also search to see if there is a set that already exists.
Create questions and put them in a PowerPoint. Students answer by holding up a QR code card that you provide with A, B, C, or D side up and you use your phone to scan the answer cards. Like clickers but without the need for clickers.