The set is marked Ages 3+. Younger kids start with color matching and building whole circles, and the fraction labels become useful as they grow. The pieces are small, so the littlest hands should play with supervision.
Yes — every bar and pie slice has a magnetic back that grips the page, so a half-finished layout holds up to table bumps and car rides.
No. It's fully hands-on: no batteries, no electronics, no sounds.
Yes, the included marker is dry-erase and wipes off the practice surfaces with a tissue or dry cloth.