Nancy Pelosi may want to get her math straight before she starts talking about tax policy.

The House minority leader took to Twitter on Wednesday evening to blast “trickle-down economics” and the presidents who supported it — incorrectly labeling George H.W. Bush “43” and George W. Bush “44” in the process.

“Reagan. Bush 43. Bush 44. They all tried ‘Trickle-Down Economics.’ And not once did it help working families,” Pelosi tweeted, along with the hashtag #NotOnePenny.

For those who aren’t aware, George H.W. Bush was the 41st president of the United States — while his son W. was the 43rd.

Pelosi’s post wound up sparking countless replies, with many pointing out the error.

“Nancy Pelosi thinks George W. Bush was the President immediately after his father. Where did Bill Clinton go?” tweeted Daily Caller reporter David Hookstead.

“Even Nancy Pelosi admits that @BarackObama is nearly identical to George W Bush,” added Andrew Magloughlin.

Miguel Radimez said, “In Pelosi’s world it would have been a Bush Hat Trick. 43, 44 & 45.”

Pelosi (D-Calif.) later deleted the tweet and fired off another one, with the correct numbers.

“Yay..you must have sobered up Nan. You got the Bush numbers correct this time,” wrote one Twitter user in response.

Pelosi has been a vocal opponent of trickle-down economics in the past. She believes the GOP’s ongoing push for tax reform is actually a way to enact the theory.

“Don’t call it reform, because it is not reform,” Pelosi said last month. “It’s just more of the same trickle-down economics that want hardworking middle class families to pay more. And we say, not one penny more in deficit-exploding tax breaks for the wealthiest in our country.”