Cartesius vs 9

Are you a parent, student or employee of Cartesius? Then download the Cartesius app and log in with the account info you've received via e-mail. Didn't receive an invitation, but still want to check the latest news of Cartesius? That's also possible without login! • Complete news feed Check the news feed of the school, with the latest updates from social media, the website or the app • Clever forms No more lost letters or e-mails! See what you have to do in a single glance and fill in forms directly in the app. • Messages and notifications Do you have a question for the school or mentor? Send a message via the hoy app and engage in a simple two-way conversation. • Practical calendar Quickly check the school calendar and turn on notifications for specific events.

Math boring? Give this five minutes. 9-Box trains times tables from 1 to 9. Kids get it immediately. Adults discover they're rustier than they thought. The grid has 9 blocks, 9 squares each, 81 problems total. Each block has a big background number. Each square has its own number. Multiply them, type the answer. Simple to understand, embarrassing to mess up under pressure. Five modes Plus+ shows you which square to solve next, a nudge for beginners. Pro removes all help: just you and 81 problems. Speed Run ends the moment you make one mistake. Your best time and your best attempt are saved separately, which creates a different kind of pressure than a simple high score. Table Select lets you pick one table or a few, useful when you know exactly where you're losing time. Mixed Sprint is 30 random problems from all tables. Done in a few minutes. Progress Each mode saves your best time, your previous time, and total games played.