Question about learning quantities on computer

I recently downloaded the PowerPoint presentation with quantities of red dots from 1-100. I noticed it had no sound with each slide saying the number of dots on the slide. Is this because most people want to record their own voice for their kids to hear or is this because they don’t normally hear the number at this stage?

Was it a Brillkids file or a members? If it was a members, the member may not have added pronunciations. Some people don’t have mics.