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Unit 6

Lesson 5

Life & Disability Insurance: Term vs. Whole Life Mathematics

Last Updated: 5/18/2026
Preparation
Prep
Lesson Narrative

Students analyze the mathematics of life and disability insurance. They will calculate how disability insurance protects a worker's most valuable asset (their future income) and compare the high premiums of Whole Life insurance against the cost-effectiveness of Term Life insurance, proving the "Buy Term and Invest the Rest" wealth strategy.

Learning Goals

• Differentiate between Term Life and Whole Life insurance structures.

• Calculate the opportunity cost of high Whole Life premiums compared to index fund investing.

• Evaluate the necessity of short-term and long-term disability insurance for protecting lifetime income.

Student Facing Learning Goals

• Let's calculate the cheapest way to protect our families if we pass away, and how to protect our paychecks if we get injured.

Student Facing Learning Targets

• I can explain why Term Life is usually a better financial choice than Whole Life insurance.

• I can calculate the income replaced by disability insurance.

• I understand what my biggest financial asset actually is.

Required Academic Standards

National Jump$tart Standards:

• Risk Management and Insurance (Standard 1): Determine how to manage risk and protect against financial loss.

Glossary Entries

Term Life Insurance: A policy that provides coverage for a specific period of time (e.g., 20 years) and pays out only if the insured dies during that term.

Whole Life Insurance: A permanent policy that covers the insured for their entire life and includes a savings component (cash value), but charges massive premiums.

Beneficiary: The person designated to receive the financial payout from a life insurance policy.

Disability Insurance: A policy that pays a percentage of a worker's income if they are injured or ill and cannot work.

Income Protection: The concept of using insurance to guarantee a stream of cash flow if your physical ability to labor is compromised.

Lesson
Lesson
Warm Up

6.5.1: The Million Dollar Asset

Launch: Have students stand in randomized groups of 3 at vertical whiteboards. Present the prompt verbally or project it. Give them 4 minutes.

Synthesis: Select two groups to share. Establish the baseline: A young person's most valuable asset isn't their car or their savings account; it is their ability to earn a paycheck for the next 40 years.

Student Facing Task

Student-Facing Task: If you make $50,000 a year from age 25 to age 65, you will earn a total of $2,000,000 in your lifetime.

1. If you get into an accident tomorrow and can never physically work again, what happens to that $2,000,000?

2. What is mathematically the most valuable asset you own right now?

Activity 1

6.5.2: Disability Income Math

Launch: Keep students at whiteboards. Project the disability scenario. Give groups 8 minutes to run the calculations.

Synthesis: Have the class observe the boards. (Teacher Key: 60% of $4,000 = $2,400/month. They are short $1,600 compared to their old income). Emphasize that long-term disability is critical, but it rarely replaces 100% of income, making an emergency fund essential.

Student Facing Task

Student-Facing Task: A worker takes home $4,000 a month in income. They suffer a severe back injury and go on Long-Term Disability. The insurance policy pays 60% of their normal income while they recover.

1. Calculate their new monthly income from the insurance company.

2. If their monthly bills (rent, food, car) cost $3,000, are they financially secure while recovering?

Activity 2

6.5.3: Term vs. Whole Life Math

Launch: Present the premium comparison. Give the whiteboard groups 10 minutes to calculate the opportunity cost.

Synthesis: Facilitate a class debate. (Key: Difference is $225/month. Over 30 years, investing that $225 builds massive wealth, far outpacing the poor returns of Whole Life). Teach the golden rule of insurance: Insurance is for risk transfer; the stock market is for wealth building. Never mix the two.

Student Facing Task

You want $500,000 of life insurance to protect your family.

• Option A (Term Life): Costs $25 a month for a 30-year term. If you don't die in 30 years, it expires.

• Option B (Whole Life): Costs $250 a month for your entire life, but builds a small "cash value" savings account inside it.

1. Calculate the exact dollar difference in the monthly premium between Option A and Option B.

2. "Buy Term and Invest the Rest" is a famous strategy. If you choose Option A, and invest that extra cash difference into an S&P 500 Index Fund every month for 30 years, why will you likely end up vastly wealthier than if you chose Option B?

Lesson Synthesis

Narrative: Bring the class back to their seats. Review the student-facing learning targets. Summarize: "Protect your income with disability insurance while you are young. Buy cheap Term Life insurance to protect your dependents, and invest the savings so you become 'self-insured' later in life."

Cool Down

6.5.4: The Dependency Test

Narrative: This exit ticket serves as a formative assessment on the necessity of life insurance.

Teacher Rubric: A successful response must state that Person A does not need life insurance because no one relies on their income to survive. Person B absolutely needs life insurance to replace their income so their three children don't become homeless if they pass away.

Student Facing Task

Based on the mathematical purpose of life insurance, who actually needs to buy a policy today: Person A (a single 25-year-old with no kids and no debt) or Person B (a 35-year-old sole breadwinner with three children)? Explain your logic.

Assignments
Materials
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