Some DIY jobs require basic maths knowledge for them to be done effectively. For example, a person needs to work out the amount of materials required in order to decorate a house. One has to be aware of the measurement, space and shape of the area he is working on to ensure that he or she has purchased the required amount of materials. This helps in ensuring that you do not run out of essential materials before the job is finished or you do not have too much left over.