Grade 2 Learning - new quiz taking tool

Bonjour! I have tried a new quiz taking tool with both classes called 'plickers'. It is an app that allows students to answer a multiple-choice question by lifting up a card while the teacher 'scans' the answers and gets the data right away (ie which students picked which answers). This is great for me as I can see in a hurry if no one is with me (!) and I can make adjustments accordingly. It also can tell me who is understanding the problem in what way.

The cards look like this:

Every student gets one, and as you can see if you look closely, each 'side' of the design has a letter from A to D. I put the question and possible answers on the board, and the student holds whatever letter they think the answer is upwards and just hold it up while I 'scan them' from the board, getting instant results!

The number 14 is just identifying that this is the 14th card in the set. This card will always be given to the student who is 14th alphabetically in the class (I have written the names on the back).