We present nine short and engaging tasks designed to assess learning and development in children ages 5-12 years across a wide range of languages and cultures. Using a simple and uniform multi-alternative forced-choice format, these tasks measure constructs including math, executive function, language, reasoning, and social cognition, and can be administered on a tablet or computer, both in person and remotely, with all materials openly available. We report on their reliability and validity in a sample of 1034 children recruited from sites in Colombia, Germany, and Canada. Tasks are scored using multi-group item response theory models, allowing testing for measurement invariance, and the parameters can be used to create computer adaptive versions of the tasks, allowing the entire battery to be given in around an hour.