The man from Kumasi used his blackboard to meticulously draw a diagram of the popular Microsoft Word program.
"Teaching of ICT in Ghana's school is very funny," he said in a Facebook post alongside the photos.
After the images were shared thousands of times online, Microsoft promised to send him new computer equipment.
In his Facebook message, Owura Kwadwo - a nickname for the man Quartz Africa identified as Richard Appiah Akoto - wrote: "I love my students so have to do what will make them understand what [I] am teaching."
Quartz said Mr Akoto's school had not had any computers since 2011, despite the requirement for teenagers to pass an information and communications technology (ICT) exam as part of their progression to high school.