Mayor de Blasio must’ve thought he was doing stand-up comedy Monday night at the Apollo — because his vow to create 100,000 jobs was a real knee-slapper.

Hizzoner was focusing his State of the City speech on Gotham’s “affordability crisis.” He said “half of the equation” is jobs.

Yes, jobs are key. But the idea that de Blasio (of all people) will snap his fingers and — puff! — tens of thousands of jobs will materialize is simply preposterous.

Even the mayor admits his 100,000 jobs — many supposedly to pay $50,000 a year and up — won’t fully appear for another 10 years. That is, long after he’s left office.

Start with his $136 million plan for a “hub” in Sunset Park for clothing makers and film and TV companies. If all goes well (cross your fingers), de Blasio says it’ll lead (eventually) to . . . all of 1,500 jobs.

That’s right: 1,500 jobs — at a cost to taxpayers of $91,000 a job. (And that doesn’t count Gov. Cuomo’s own $420 million a year to supposedly boost film and TV jobs.)

It gets worse: De Blasio means to spend $2.6 billion to turn public buildings “green,” creating “30,000” jobs for retrofitters. Please: That’s more of a make-work jobs program than a boost to private-sector employment. Anyway, the jobs are temporary.

Besides, even Hizzoner’s fantasy 100,000 jobs would grow New York’s 3.6 million-job work force by just 2.8 percent — which is less than the growth the city’s already seen over the last 10 years.

Yet the biggest irony is that de Blasio has practically done everything in his power to discourage job growth — like pushing for a $15 minimum wage, paid sick leave and family leave, all of which make it more expensive for employers to hire workers.

If Hizzoner truly sought to gin up jobs, he’d move to scrap all the mandates on employers and lower New York taxes, perennially among the highest in the nation.

He could also make New Yorkers more attractive to employers and push up wages by seeing that kids get a decent education in the public schools. Right now, two out of three kids who graduate aren’t ready for college or the workplace — yet the mayor brags of gains he’s made in the schools.

No, de Blasio’s “plan” for 100,000 jobs only makes sense as comedy — a cruel joke on New Yorkers.

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