They used maths to communicate and ask questions..This was done through sign communication. They drew with the help of lines on the walls or bark of trees.
Chat with our AI personalities
The same reason that people of other countries use maths.
I use maths in the kitchen to calculate cooking times and the weights and measures of ingredients.
Through sundials,water devices etc
For the same reasons that we need to use maths today.
good maths =)