Math Olympiad Contest Problems For Elementary And Middle Schools By George Lenchner Great

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Take a guided, problem-solving based approach to learning Everyday Math. These compilations provide unique perspectives and applications you won't find anywhere else.

Order of operations refers to the conventional order in which mathematical operations must be completed. In general, the rules for order of operations require that we perform operations in the …

Guided interactive problem solving that’s effective and fun. Try thousands of interactive lessons in math, programming, data analysis, AI, science, and more.

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We say two quantities are in the golden ratio if their ratio is equivalent to the ratio of the sum of the quantities to the larger of the two quantities. It is obtained by dividing a line into two parts such …

When quantities are proportional, their ratios are equal. For example, the ratios 2 5 52 and 8 20 208 are proportional. Note that 4 10 104 and 12 30 3012 are equivalent fractions because they both …

The imaginary unit i i is a number that is not a real number. The real number system R R is extended to the complex number system C C taking i i into account: C = {a + b i ∣ a, b ∈ R} C = {a+bi∣a,b ∈ …

A median is a measure of central tendency which divides data into 2 2 parts, separating the upper and lower half of the data by a value which is called the median value. Before calculating a …

A matrix is a rectangular array of numbers, arranged in rows and columns. For instance, the left matrix has two rows and three columns, while the right matrix has three rows and two columns: ...