A 12-question mission. Take your time. Your proof matters more than your speed.
Choose your route
Bring your thinking.
Use paper or a mini-whiteboard. For lists, separate numbers with commas or spaces. The order does not matter.
After two incorrect attempts, study a specific hint or choose to see the solution. Solutions you study count separately.
Written explanations are for you and your teacher to discuss; the app checks the number or choice.
MISSION COMPLETE
Your thinking
made progress.
Your score uses the first checked answer in each question's latest attempt. Redo any question for a fresh scored attempt. A certificate needs more than 70% (at least 9 out of 12).
YOUR ACHIEVEMENT
Earn your Number Lab certificate
You have earned a certificate! Enter your name, then download your PDF.
Your name stays in this open tab. It is used only for your certificate.
Review, redo and improve
Choose one question below. Explain the method to a partner without looking at the solution.