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Math lesson · Calculations

Ten Common Real Estate Math Mistakes

The ten most expensive math mistakes are answering the wrong target, using the wrong base, mixing time periods, mishandling percent conversion, reversing a ratio, double-counting a deposit, confusing gross income with NOI, reversing debits and credits, ignoring statutory round-up rules, and accepting an unreasonable result.

Facts checked against the current PSI Candidate Information Bulletin and GREC sources. Editorial standards.

What is the exam-ready answer?

The ten most expensive math mistakes are answering the wrong target, using the wrong base, mixing time periods, mishandling percent conversion, reversing a ratio, double-counting a deposit, confusing gross income with NOI, reversing debits and credits, ignoring statutory round-up rules, and accepting an unreasonable result.
Official syllabus mapping for Ten Common Real Estate Math Mistakes
Official syllabus topicXI Real Estate Calculations: integrated error prevention across all transaction and general concepts
Official PSI areaReal Estate Calculations
Published weight7% of the 100-question national portion
Source editionPSI Georgia Candidate Information Bulletin dated July 1, 2026

The Rule

PSI publishes a weight for the complete official area, not a guaranteed count for this individual calculation. Follow the stated facts, units, time basis, and rounding instruction.

Formula and variables

Error-proof calculation check: Target, base, formula, period, direction, units, rounding, reasonableness
Variables used in Error-proof calculation check
Symbol or termMeaning
Setup errorA wrong target, base, formula, period, or direction before arithmetic begins
Execution errorA conversion, calculator, rounding, or unit mistake after the setup
VerificationA magnitude, inverse-formula, balance, or alternate-route check

Step-by-step method

  1. Write the target, base, period, direction, and unit.
  2. Name the formula and cross out decoy numbers.
  3. Convert percentages and periods before combining amounts.
  4. Apply statutory rounding and final-answer precision in the correct order.
  5. Verify by estimation, inverse calculation, debit-credit balance, or a second route.

Georgia-specific distinction

Georgia adds three recurring base errors: using sale price for intangible recording tax, using loan amount for transfer tax, and applying millage to full fair market value instead of taxable assessed value. It also adds statutory fractional-unit rounding for transfer and intangible taxes.

Worked examples

Example 1: One stem, three Georgia bases

Scenario. Price is $400,000, the qualifying note is $320,000, and fair market value is $390,000. The question asks for intangible recording tax.

  1. Target identifies the qualifying note as the base.
  2. $320,000 / $500 = 640 units.
  3. 640 x $1.50 = $960.

Answer. The tax is $960. The price and fair market value are decoys for this target.

Reasonableness check. Transfer tax would use consideration and property tax would first assess fair market value, so neither belongs here.

Example 2: Catch a ratio reversal

Scenario. A $240,000 loan is made on a $300,000 value, and a candidate gets 1.25.

  1. LTV must be loan / value, not value / loan.
  2. $240,000 / $300,000 = 0.80, or 80%.
  3. The 1.25 result came from reversing the ratio.

Answer. Correct LTV is 80%.

Reasonableness check. A loan smaller than value should not produce an LTV above 100%.

Common exam traps

  • Starting calculator work before naming the requested answer
  • Trusting a familiar-looking answer choice instead of checking the setup
  • Memorizing one proration convention as universal
  • Treating a precise calculator output as proof that the formula was correct

Original practice questions with detailed explanations

These original instructional questions map to the July 1, 2026 PSI outline. They are not copied from PSI or any live examination. Write the setup before opening the explanation.

Question 1

A Georgia home sells for $450,000 with a fair market value of $440,000. The buyer signs a $360,000 qualifying long-term note secured by the home. What is the intangible recording tax?

  1. A. $360
  2. B. $720
  3. C. $1,080
  4. D. $1,350
Show answer and explanation →

Answer: C. $1,080

The base is the note: $360,000 / $500 = 720 units, and 720 x $1.50 = $1,080. $1,350 uses the sale price, the wrong base for this tax. $720 stops at the unit count and never applies the $1.50 rate.

Question 2

A candidate divides a $400,000 value by a $340,000 loan and reports an LTV of 117.6%. What is the correct LTV?

  1. A. 8.5%
  2. B. 15.0%
  3. C. 85.0%
  4. D. 117.6%
Show answer and explanation →

Answer: C. 85.0%

LTV is loan divided by value: $340,000 / $400,000 = 85%. A loan smaller than the value cannot produce an LTV above 100%, which exposes the reversed ratio. 15% is the down-payment share, not the LTV.

Question 3

A fourplex rents for $2,000 per unit each month with no vacancy. Annual operating expenses are $26,000 and the value is $1,100,000. What is the cap rate?

  1. A. 0.53%
  2. B. 6.36%
  3. C. 8.73%
  4. D. 15.71%
Show answer and explanation →

Answer: B. 6.36%

Annual gross rent is $96,000, so NOI is $70,000 and $70,000 / $1,100,000 = 6.36%. 8.73% divides gross rent by value, the wrong income measure. 0.53% uses one month's NOI against a value tied to annual income.

Ready to move on?

You have this calculation down when all of these are true.

  • I can name all ten recurring error types.
  • I record whether each miss was setup or execution.
  • I know the three major Georgia tax and assessment bases.
  • I use at least one independent verification method.
  • I can solve mixed questions without a topic label.

Recommended next lesson

Continue with How Much Math Is on the Georgia Exam?. There you will see how PSI weights calculations: 7% of the 100 scored national questions, with more math possible inside the 15-question Georgia Finance and Closing group.

Return to the complete calculation hub, formula sheet, or mixed math drill.

Ten Common Real Estate Math Mistakes questions

Facts checked against the current PSI Candidate Information Bulletin and GREC sources. Editorial standards.

Is Ten Common Real Estate Math Mistakes on the Georgia real estate exam?

It maps to XI Real Estate Calculations: integrated error prevention across all transaction and general concepts in the official Real Estate Calculations area. PSI assigns 7% of the 100-question national portion to the complete area but does not guarantee a count for this individual formula.

What formula should I use for Ten Common Real Estate Math Mistakes?

Target, base, formula, period, direction, units, rounding, reasonableness

What Georgia-specific point should I remember?

Georgia adds three recurring base errors: using sale price for intangible recording tax, using loan amount for transfer tax, and applying millage to full fair market value instead of taxable assessed value. It also adds statutory fractional-unit rounding for transfer and intangible taxes.

Can I use a calculator on the Georgia real estate exam?

PSI provides an online calculator during the examination. Handheld calculators are prohibited. Write the setup and label the units before entering numbers.