Fact checker PolitiFact set out Wednesday to disprove President Trump’s claim that the Ninth Circuit Court of Appeals has an 80% overturn rate.

…the Ninth Circuit, which has a terrible record of being overturned (close to 80%). They used to call this "judge shopping!" Messy system.

— Donald J. Trump (@realDonaldTrump) April 26, 2017

In doing so, the fact checker inadvertently demonstrated that they are incapable of performing basic arithmetic.

PolitiFact used the statistics from SCOTUSBlog’s Supreme Court statistics archive.

SCOTUSBlog provides “Circuit Scorecards” for each year, and from this data PolitiFact “calculated” their numbers.

If you’d like to follow along, here are direct links to scorecards used by PolitiFact to come up with their numbers:

(2010) (2011) (2012) (2013) (2014) (2015)

PolitiFact stated the following:

The Supreme Court reversed about 70 percent of cases it took between 2010-15. Among cases it reviewed from the 9th Circuit Court of Appeals, it reversed about 79 percent.

PolitiFact also “calculated” the reversal rate for each circuit court from 2010 to 2015:

- 6th Circuit – 87 percent
- 11th Circuit – 85 percent
9th Circuit – 79 percent- 3rd Circuit – 78 percent
- 2nd Circuit and Federal Circuit – 68 percent
- 8th Circuit – 67 percent
- 5th Circuit – 66 percent
- 7th Circuit – 48 percent
- DC Circuit – 45 percent
- 1st Circuit and 4th Circuit – 43 percent
- 10th Circuit – 42 percent

These numbers are demonstrably false.

#### Here’s how PolitiFact messed up

PolitiFact “calculated” that the Supreme Court reversed 79 percent of cases received by the 9th Circuit Court of Appeals from 2010 to 2015.

That’s incorrect.

From 2010 to 2015, the Supreme Court took **103 cases **from the 9th Circuit Court of Appeals.

The Supreme Court reversed **77** of those cases.

77 divided by 103 = **74.76**** percent**

The correct number is **74.76**** percent**

Here’s how the **Pulitzer Prize-winning journalists at PolitiFact** “calculated” 79 percent from that data.

Instead of adding up each affirmed and reversed case, they just took the average of the end-year percentages provided on each SCOTUSBlog scorecard from 2010 to 2015.

79 + 71 + 86 + 92 + 63 + 80 = 471

471 divided by 6 = 78.5

PolitiFact rounded up to get **79 percent.**

**PolitiFact — this is not how you calculate percentages.**

PolitiFact also failed to calculate the 3 cases affirmed by a 4-4 split decision by the Supreme Court from 2010 to 2015.

#### Give it up for the Pulitzer Prize-winning journalists at PolitiFact

PolitiFact incorrectly calculated *every single number* in their report.

To make matters worse for the “fact-checkers” at PolitiFact — the correct calculation of the 9th circuit’s reversal rate makes President Trump’s argument against the 9th circuit a lot weaker.

So, give a round of applause to PolitiFact for inadvertently *defending* President Trump.

#### The correct numbers

Below are the corrected calculations for what PolitiFact provided in it’s “fact check” report.

The Supreme Court reversed **68.87 percent** of cases it took between 2010-15. Among cases it reviewed from the 9th Circuit Court of Appeals, it reversed **74.76**** percent.**

From 2010 to 2015, ranked highest to lowest reversal rate:

- 11th Circuit – 87.5 percent
- 6th Circuit – 84.85 percent
**9th Circuit – 74.76 percent**- State – 73.85 percent
- 3rd Circuit – 73.08 percent
- 8th Circuit – 72.73 percent
- 5th Circuit – 69.23 percent
- Federal Circuit – 67.86 percent
- 2nd Circuit – 57.14 percent
- 7th and 10th Circuit – 55.56 percent
- DC Circuit – 52.63 percent
- Dist. Court – 50 percent
- 4th Circuit – 48 percent
- 1st Circuit – 46.15 percent

It’s also worth noting that the 103 cases from the 9th Circuit heard by the Supreme Court from 2010 to 2015 represented **21.96 percent **of the Supreme Court’s 469 cases from 2010 to 2015

#### Conclusion

Take what PolitiFact reports with a grain of salt.

And to the Pulitzer Prize-winning journalists at PolitiFact…

Khan Academy offers a great set of courses on basic arithmetic. I suggest starting off with addition and subtraction:

In this topic, we will add and subtract whole numbers. The topic starts with 1+1=2 and goes through adding and subtracting within 1000. We will cover regrouping, borrowing, and word problems.