The Three Numbers Every High School Student Should Know
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| Ask any teenager what numbers they’ve memorized, and you’ll likely hear the same answers: a phone number, maybe a locker combination, and if you’re lucky, their Social Security number. But there’s another number—just as critical—that
The “Lifestyle Number”
This number represents the annual cost of the lifestyle a student envisions for themselves at age 29. Why 29? It’s far enough in the future to be meaningful—many young people can imagine themselves living independently, perhaps with a partner or family, and working in the career of their choice—but close enough that the decisions they make in high school directly impact whether that dream is achievable.
Financial Literacy, Reimagined
For years, educators and parents have advocated for stronger financial literacy in schools. With that increased focus over the past few years, now more than half of U.S. states require high school students to take a personal finance course before graduation. Yet too often, financial education remains abstract. Students can define compound interest, explain APR, and list savings account benefits—but few can answer this critical question: How much will the life I want actually cost, and how will I afford it?
When we fail to help teens make the connection between financial concepts and their own future, they graduate unprepared, taking on student loans, credit card debt, or career paths without understanding whether their income can support the lifestyle they envision for themselves.
A Wake-Up Moment
Asking students to calculate the cost of their envisioned lifestyle can be transformative. Want an urban apartment, a new car, and a vacation each year? How much does that total annually? Planning to buy a home, raise children, and save for the future? What is the cost? What salary will make that possible?
When students work through what has become known as “the budget exercise,” a project where they make real-world lifestyle choices and then research and calculate the financial implications, educators often witness a profound “wake-up moment.” After that realization, a good education becomes an imperative. As Mindy Bingham, best-selling author of Lifestyle Math shares:
“When students know the cost of their own lifestyle, math and money stop being abstract. They stop asking, ‘When will I ever use this?’ and start saying, ‘I need this now.’”
A Role for Families
This isn’t just a school issue. Parents and grandparents can help by: 1. Asking the Question: “What do you want your life to look like at 29?” Encourage specifics—housing, transportation, family, lifestyle. 2. Doing the Math Together: Research real costs—rent, car payments, childcare, groceries, insurance. Add them up. 3. Connecting to Careers: Compare that budget total to salaries in careers they’re considering. 4. Discussing Trade-Offs: If there’s a gap, what needs to shift—the lifestyle, the career, or the education path?
This exercise grounds dreams in reality while supporting teens’ ambitions.
A Smarter Way to Teach Money
Programs like Lifestyle Math are bringing this approach to classrooms nationwide. Rather than just focusing on financial definitions, students also calculate personalized lifestyle budgets, build financial planning portfolios, and see the real-world impact of their educational choices.
“Every teen deserves to know not just how money works, but how money can work for them,” says Bingham. “That’s what changes behavior—not just vocabulary or worksheets, but real numbers tied to their own lives.”
The Bottom Line
Every high school student should leave school knowing three numbers by heart: their phone number, their Social Security number, and the annual cost of the lifestyle they envision at age 29.
Knowing that third number helps students avoid drifting into adulthood unprepared. Instead, they gain control—making informed choices today about their education and training that will shape the life they want tomorrow. |
few are asking teens to learn.