Task: I would like to use the oppia app to help my child with their math homework, thus i want to view chapter on understanding naming numbers 
Steps:
click on the cross icon at upper left corner of the screen 
click on revision topic at center left side of the screen 
choose top second option ( naming numbers ) at the screen 
swipe down to view the chapters details 
swipe down to view the chapters details 
swipe down to view the chapters details