Logarithms. Number bases. The Pythagorean Theorem: If you had a nickel for every time you asked “When are we ever going to use this?” you’d have, well, lots of nickels.

But if there’s one math skill you and the average sixth grader can master with ease, it’s percentages. So in honor of two of our personal faves — sales and alcohol — here are four restaurants that offer discount wine nights.

Santo (430 Lincoln Road, Miami Beach; 305-532-2882) spices up contemporary American dishes with Latin and Asian flavors, and its Sushi Tuesdays dish out six specialty rolls and 50 percent off bottles of sake all night. Meanwhile, Talula (210 23rd Street, Miami Beach; 305-672-0778), where flavors run from bold Southwestern to sleek Japanese, offers 25 percent off its entire Wine Spectator Awarded list on Sunday evenings.

Caribbean-cool Ortanique (278 Miracle Mile, Coral Gables; 305-446-7710) asks how low you can go on Temptation Tuesdays with 50 percent off 95 percent of their wine list, and Novecento (1080 Alton Road, Miami Beach; 305-531-0900; 1414 Brickell Avenue, Brickell; 305-403-0900) shows its Argentine hospitality with half off all bottles on Tuesdays.

And that’s sum deal.