Mayoral candidate Andrew Yang indicated Wednesday that he’s ready to teach Mayor Bill de Blasio some basic math if elected to succeed him, especially when it comes to his most recent, record-breaking budget proposal.

“I’m concerned Bill de Blasio’s administration has been really undisciplined about its use of resources,” Yang said on WNYC radio.

“Right now they project that we’re going to see a $5 billion deficit in 2023 and I think common sense dictates if you project a deficit at that level you should probably be planning for it right now and we’re not seeing that sort of planning,” Yang said.

“We’re not seeing even basic cost efficiencies being asked of agencies,” he added.

Oversight groups have blasted de Blasio’s most recent $98.6 billion spending plan — the largest in city history — for sticking his successor with deficits of almost $4 billion, a figure that grows to nearly $5 billion unless the city gets major concessions from its labor unions.

“The plan leaves a looming fiscal cliff,” Citizen’s Budget Commission head Andrew Rein said in a recent report.

And critics say de Blasio is spending $6 billion in federal pandemic recovery funds “like a drunken sailor” on big-government investments the city can’t afford and doesn’t need like a $234 million for a cleanup corps — whose mandate to sweep the streets is strikingly similar to the job of sanitation workers. 

“Most New Yorkers I talk to don’t think that governments has been working for them for the past number of years,” Yang said, citing piles of trash overflowing on city streets.

“Our city’s budget has gone from about $60 billion ten years ago to about $90 billion today,” Yang said. “Who listening to this thinks our city services have gotten 50% better in that time?” he said.

While Yang’s math was off just slightly — Bloomberg’s budget in 2011 was $66 billion compared to de Blasio’s $98.6 billion proposed plan this year. In the middle of the pandemic last year the budget was $92.8 billion.

De Blasio spokesman Bill Neidhardt responded, “It might surprise Mr. Yang to learn New York City has reserve levels higher than when his favorite billionaire Bloomberg left office.”

Bloomberg had an anticipated budget deficit of $5.4 billion when he left office at the end of 2013. In a recent interview on Showtime’s “Ziwe,” Yang said former Mayor Michael Bloomberg was his favorite billionaire because of his environmental record and ending smoking in city bars.

Neidhardt added: “Joe Biden and Chuck Schumer secured a stimulus for New York City, it’s insulting to working families to say New York City shouldn’t invest that money right away to create jobs, drive economic growth and put COVID behind us once and for all.”

Additional reporting by Nolan Hicks