Ask yourself and those who know you well what stories most represent who you are. You can explain situations from your past that inspired your career pursuits. I assumed I would follow a similar, albeit boring, path in life. When I was a child, I used math to run a lemonade stand.
You should: Describe a definite event, experience or change; Include at least one strong example that makes the picture fuller; Show effects, consequences, how some events affected you in person and what your experience gave you. Conversely, ask yourself what would be distracting lines and filler that would detract from the message of who you are in relation to the job.
The same applies to the process of essay writing. Name the resources you took to complete your task and organize them in accordance with your academic style. If you draw proper conclusions, you will show the high level of understanding what you have depicted in your own story.
From this experience, I learned the importance of adaptability. A more effective attention grabber may point out a specific, and perhaps surprising, instance when adults use math in their daily lives, in order to show the reader why this is such as important topic to consider.