why is doing pencil and paper computations not doing mathematics

http://www.tribunnews.com/member/b2mboeo744

Beat Exam Stress <h1>Beat Exam Stress</h1> <p><div style="clear:both; text-align:center"><img alt="Person Holding White Paper" src="https://images.pexels.com/photos/533444/pexels-photo-533444.jpeg" title="Person