Try a Proof Block
A proof, cut into lines and shuffled. Put the lines in an order that proves the statement, leave out the ones that don't belong, and check the structure. If you get stuck, hints are there, and you can reveal one valid order.
Try a sample Proof Block
One short sample, free to try. Arrange the lines into a proof and check its structure. Checks run on ProofAnvil without an account; nothing is saved or graded, and this sample is not part of any course.
Proof Blocks with a Practice membership
Members get reviewed Proof Blocks activities in these courses, at standard and honors levels, with feedback, hints and completed activities saved to their account. A free account can try the first two activities of each. Pick a course to open it:
- Real Analysis I245 activities
- Real Analysis II198 activities
- Linear Algebra I56 activities
- Linear Algebra II19 activities
Members can also play Survival: work through every Proof Block in a course, from easiest to hardest. Three wrong answers and the run ends.
Proof Blocks checks the structure of an arrangement. It is study practice, not a grade, and it does not measure mastery.
A free account opens the first unit of every course, with hints and solutions.