Proofs by contradiction are like the detective stories of mathematics—you assume the suspect is innocent, follow the clues, and then realize they’ve been guilty all along. The logic is sneaky, the reasoning elegant, and when it clicks… it really clicks. The bad news? At first, it feels backwards. You start by assuming the opposite of what you want, and somewhere along the way you’re supposed to end up proving yourself right. Confused? Don’t worry—you’re supposed to be (at first). Stick around for the lessons and videos below, and soon you’ll be exposing false assumptions like a mathematical Sherlock Holmes.
Start here
Start by downloading the cheat sheet and the vocabulary below. After that, move to the video lessons with their respective exercise lists.
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Video lessons
Learn the content with the videos provided and reinforce your comprehension by practicing with the exercise list above.
Take the mock exams
It’s time to put your knowledge to the test with our mock exams — the closest experience you’ll get to the real IB Math exams. Note: read the instructions on taking mock exams here.
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