As well allowing objects to animate on the click of the mouse and after a particular length of time in a PowerPoint slideshow, objects can also be made to animate when another object on a slide is clicked on. This can be achieved by using triggers, where the start of an effect is triggered by the click of a specified object:
This can be useful if you want things to change the colour of an object in an activity since you simply need to make an object change its fill colour several times using the emphasis animation effect, with each colour change being placed in sequence and starting on the click of a particular object:
To demonstrate this principle, I've created a quick set of addition activities for Year 1 children to complete. They are all basically variations on the theme of making two matching objects the same colour (e.g. number bonds, calculation/answer). Click the picture below to download and play this activity.