This might be why J.Law earned less than her male co-stars

Jennifer Lawrence, the world’s highest-paid actress, used fuzzy math when she griped that she was the victim of sexism and didn’t earn as much as her male co-stars in “American Hustle,” it was reported Sunday.

The 25-year-old Oscar winner came to the project late in the game and worked half as many days as co-stars Christian Bale and Bradley Cooper, according to the website Deadline.

Lawrence also failed to note the handsome windfall that followed the hit film, which snagged 10 Oscar nominations and increased her cachet with its success, the site said. She scored big time afterward, including netting $20 million for the sci-fi adventure “Passengers” out next year — or an estimated $5 million to $7 million more than her male co-star, Chris Pratt.

“While it’s refreshing to see Lawrence put herself out there for a worthy cause, I’m not sure that ‘American Hustle’ is the movie to use as Exhibit A,” said industry writer Mike Fleming Jr. on the entertainment biz site.

Lawrence had lamented she netted $1.25 million compared with Cooper’s and Bale’s $2.5 million each, a disparity first revealed from hacked emails of Sony executives.

She said she didn’t put up a fight because “I didn’t want to seem ‘difficult’ or ‘spoiled.’”