Put on your math cap for PBS series that adds up to one hour this week

“Mathnet,” the popular segment of PBS’ award-winning kids’ daytime series “Square One TV,” which aims to create positive attitudes toward math, goes prime time with the one-hour special Mathnet: The Case of the Galling Stones.

The comedy-mystery finds “Mathnet” super-sleuth Pat Tuesday (Toni DiBuono) accused of stealing a priceless, 300-year-old bracelet from the wrist of the evil ruler of Mondo Yucchy. It’s up to her partner, the intrepid mathematics detective George Frankly (Joe Howard), to muster all of his cognitive skills to prove Tuesday isn’t a thief.

And just where does the mathematics lesson come in?

The bracelet just happens to be a dodecahedron--a 12-sided gem. Enlisting the aid of an outrageous gemologist, a pompous historian and the laws of geometry, Frankly and his “Mathnet” team of gumshoes work around the clock to decipher the baffling symbolic lettering on the gem, before Tuesday is sent to the slammer.

“Mathnet: The Case of the Galling Stones , “ Monday 7-8 p.m. KCET. For 8- to 12-year-olds.

MORE KIDS’ SHOWS

Shirley Temple sings the bouncy “Fifth Avenue” in the 1940 musical-drama Young People (Sunday 2-3:30 p.m. Disney Channel). Temple plays the daughter of a show business couple (Jack Oakie and Charlotte Greenwood) who move to a farm so she can grow up away from the bright lights of the big city. For 6- to 10-year-olds.

Spectacular computerized special-effects highlight Tron (Sunday 7-9 p.m. Disney Channel), a 1982 Disney action-adventure about a computer expert who becomes trapped inside a sophisticated computer game. Jeff Bridges, Cindy Morgan and Bruce Boxleitner star. For ages 8 and up.

Tintin and Haddock discover that one of the leaders of the Khemed coup is involved in a slave-trading ring on The Adventures of Tintin (Monday 7:30-8 p.m. HBO). For 5- to 10-year-olds.

In the animated Davey Crockett on the Mississippi (Tuesday 8-9 p.m. Disney Channel), the legendary frontiersman and his pet bear Honeysuckle are on a peace mission into Indian territory when they meet up with a young boy traveling alone to live with his uncle. The two team up with Crockett’s pal, Mike Fink, the King of the Keelboats, and battle with river pirates. For 6- to 11-year-olds.

Mickey Rooney gives one of his most subdued performances in the classy 1940 bio-pic Young Thomas Edison (Wednesday 5-6:30 p.m. Showtime), which chronicles the early years of the famous inventor. For ages 9 and up and parents.

Rex Harrison stars as a kindly doctor who can talk to the animals in Doctor Dolittle (Saturday 9 a.m.-11:30 a.m. HBO), the lavish 1967 musical fantasy based on Hugh Lofting’s classic stories. Anthony Newley, William Dix, Samantha Eggar, Richard Attenborough and Geoffrey Holder also star in the film, which won Oscars for special visual effects and for best song (“Talk to the Animals”). For all ages.

While vacationing with the Martins, Lassie becomes separated from her family and travels from Wisconsin to Oregon before returning to the farm on Lassie: The Disappearance (Saturday 2-4 p.m. Nickelodeon). For all ages.