Mathematical handwriting is essential for clarity and communication in STEM fields. Key tips include: 1) Practice consistent size and spacing; 2) Use clear, legible symbols and notation; 3) Maintain proper alignment and margin use; 4) Focus on handwriting speed while ensuring accuracy; 5) Consider using lined paper to aid in organization. Overcoming common issues like messy and inconsistent writing can greatly enhance the quality of mathematical work, leading to better understanding and evaluation by peers and educators.