Geometry 16 questions Solid Geometry / Geometry in Space 19 questions Geometry of Cats Polyhedra 6 questions Regular Polyhedra 6 questions Trigonometry 2 questions Spherical Geometry 1 questions Area Calculation 82 questions Plane Geometry 49 questions Triangles 31 questions Triangle Congruence 6 questions Triangle Similarity 2 questions Circles 29 questions Tangent to a Circle 1 questions Symmetry 25 questions Angle Calculation 23 questions Plane Transformations Congruence Transformations (Isometries) 11 questions Parallel Translation / Translation 2 questions Rotation 3 questions Reflection 4 questions Pythagorean Theorem 15 questions Triangle Inequality 5 questions Vectors 5 questions Arithmetic 189 questions Fractions 42 questions Percentages 10 questions Division with Remainder 13 questions Number Theory 49 questions Prime Numbers 17 questions Prime Factorization 19 questions Chinese Remainder Theorem 1 questions Modular Arithmetic / Remainder Arithmetic 14 questions Divisibility Rules 40 questions Divisibility Rules by 2, 4, and 8 5 questions Divisibility Rules by 3 and 9 22 questions Divisibility Rule by 11 3 questions Divisibility Rules by 5 and 25 4 questions Euler's Theorem and Fermat's Little Theorem 1 questions Greatest Common Divisor (GCD) and Least Common Multiple (LCM) 11 questions Euclidean Algorithm 4 questions Triangular Numbers 4 questions Division 39 questions Parity (Even/Odd) 54 questions Combinatorics 34 questions Pigeonhole Principle 46 questions Double Counting 12 questions Binomial Coefficients and Pascal's Triangle 5 questions Product Rule / Rule of Product 25 questions Graph Theory 46 questions Matchings 7 questions Induction (Mathematical Induction) 13 questions Game Theory 25 questions Combinatorial Geometry 44 questions Cut a Shape / Dissection Problems 72 questions Grid Paper Geometry / Lattice Geometry 42 questions Invariants 29 questions Case Analysis / Checking Cases 175 questions Processes / Procedures 15 questions Number Tables 20 questions Colorings 11 questions Chessboard Coloring 20 questions Logic 5 questions Reasoning / Logic 203 questions Paradoxes 10 questions Truth-tellers and Liars Problems 15 questions Algebra 14 questions Algebraic Techniques 17 questions Short Multiplication Formulas / Algebraic Identities 15 questions Telescoping Sums 10 questions Roots / Radicals 9 questions Multiplication by the Conjugate 1 questions Equations 114 questions Diophantine Equations 26 questions Inequalities 29 questions Averages / Means 18 questions Word Problems 185 questions Motion Problems 18 questions Solving Word Problems "From the End" / Working Backwards 6 questions Sequences 33 questions Arithmetic Progression / Arithmetic Sequence 21 questions Complete/Continue the Sequence 3 questions Recurrence Relations 2 questions Proof and Example 14 questions Constructing an Example / Counterexample 45 questions Proof by Contradiction 57 questions Algorithm Theory Weighing 9 questions Set Theory 17 questions Minimum and Maximum Problems / Optimization Problems 44 questions Probability Theory 8 questions Puzzles and Rebuses 82 questions Matchstick Puzzles 9 questions Reconstruct the Exercise / Cryptarithmetic 12 questions Units of Measurement 12 questions