1019 past contests
Topic 11 · Product of $\begin{bmatrix}3&-1\\2&2\end{bmatrix}$ and $\begin{bmatrix}-1&3\\1&3\end{bmatrix}$
Topic 29 · Inserting parentheses to make $3+5^2-8\times3+5=0$ true
Topic 29 · Is $2\times5-\tfrac{1}{2}\times10\times9=45$ when grouped as $(2\times5-\tfrac{1}{2}\times10)\times9$?
Topic 29 · Is $5\times7-3+3\times5+3=44$ when grouped as $5\times(7-3)+3\times(5+3)$?
Topic 18 · Simplifying $\dfrac{3\sqrt{2}-4\sqrt{5}}{\sqrt{10}}$
Topic 18 · Multiplying the conjugates $(4+3\sqrt{5})(4-3\sqrt{5})$
Topic 18 · Simplifying $(\sqrt{1500}+2\sqrt{15})(\sqrt{15}-3)$
Topic 8 · Solving logarithmic equations using $\log a+\log b=\log(ab)$ and $\log a-\log b=\log\left(\dfrac{a}{b}\right)$
Topic 35 · The interior angle of a regular quadrilateral is $90^\circ$, not a straight angle (true/false)
Topic 34 · Riddles: similarity and congruence
Topic 33 · An isosceles triangle fits its outline in $2$ positions (true/false)
Topic 35 · The diagonals of a rectangle bisect each other but not perpendicularly (true/false)
Topic 35 · Which diagonal of a kite bisects its end angles (true/false)
Topic 36 · The exterior angles of any polygon sum to $360^\circ$ (true/false)
Topic 33 · An equilateral triangle has $3$ axes of symmetry (true/false)
Topic 26 · Evaluating $85^2-15^2$
Topic 26 · Evaluating $73^2-23^2$
Topic 26 · Evaluating $121^2-21^2$
Topic 11 · Image of $a(2,-5)$ under a $180^\circ$ rotation about the origin
Topic 11 · Image of $b(-4,0)$ under a $90^\circ$ clockwise rotation about the origin