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Real Estate MathNational portion

Income-Property Math End to EndReal estate exam study notes

One storyline covers most investment questions: 20 units at $900/month potential = $216,000 potential gross income; minus 5% vacancy ($10,800) plus $4,800 laundry = $210,000 effective gross; minus $84,000 operating expenses = $126,000 NOI.

5 key facts 5 practice questions Reviewed Oct 2026
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Key ideas

  • One storyline covers most investment questions: 20 units at $900/month potential = $216,000 potential gross income; minus 5% vacancy ($10,800) plus $4,800 laundry = $210,000 effective gross; minus $84,000 operating expenses = $126,000 NOI.
  • At an 8% cap rate, value = $126,000 ÷ 0.08 = $1,575,000.
  • Flip any leg: NOI = value × rate; rate = NOI ÷ value.
  • Cash-on-cash return = pre-tax cash flow (NOI − debt service) ÷ cash invested.
  • When a question changes ONE input (raise rents, cut vacancy), rebuild only from that line down — and never let debt service sneak into NOI.

Before you read

Test yourself first: 5 questions

Question 1 of 5

A property has net operating income of $24,000 and sells at an 8% capitalization rate. What is its value?

What you need to know

At an 8% cap rate, value = $126,000 ÷ 0.08 = $1,575,000. Flip any leg: NOI = value × rate; rate = NOI ÷ value. Cash-on-cash return = pre-tax cash flow (NOI − debt service) ÷ cash invested. When a question changes ONE input (raise rents, cut vacancy), rebuild only from that line down — and never let debt service sneak into NOI.

Income-Property Math End to End: FAQs

Is Income-Property Math End to End on the real estate exam?

Yes. Real Estate Math is a scored domain on the real estate licensing exam, and this topic appears in the national portion.

Is this cheat sheet free?

Yes — every page on Cinna RE's resource library is free to read, print and share. The app adds practice questions, mock exams and a readiness score.

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