Much sweeter and much more bittersweet than one might expect, World’s Best does some deceptively clever things with its major themes of math and rap. Somehow, this pre-teen coming-of-age story finds a way to play with preconceived notions of equations always resulting in certain answers, and of modern hip hop being all about swagger and status. Unsurprisingly (or maybe disappointingly for some), the film ultimately touches on grief and loss, which an increasing number of Disney films have been doing as of late. But World’s Best keeps itself fresh through its sincere, energetic tone, colorful production design, and spirited performances by Utkarsh Ambudkar and the young Manny Magnus. So even when the rapping gets corny (which it does more often than it should), the spirit behind it is so endearing that it’s hard to be mad.