Blow some bubbles up in the air and have the pupil pop all the bubbles with the correct fingers in order as shown on the card, before the bubbles all hit the ground!
(I use the bright and colourful Tippy Taps cards from Colourful Keys). You could also make your own cards and just write a series of 5 numbers on. Tip- use red for right hand and blue for left hand. Being consistent with use of colour is helpful when teaching young beginners.