Articles

Miles to kilometers made simple: 1 mile = 1.60934 km. Learn the exact formula both ways, a fast 5-to-8 mental trick, and a handy reference table.

Kg to lbs made simple: 1 kg = 2.20462 lb. Learn the exact conversion formula both ways, a fast times 2.2 mental trick, and a handy kg-to-lb reference table.

How many cups in a gallon? A US gallon holds 16 cups. See how gallons, quarts, pints, and cups nest, plus quick kitchen conversions and easy charts.

Metric vs imperial made simple: how base-10 metric and traditional imperial units compare, plus a master chart for length, weight, volume, and temperature.

Celsius to Fahrenheit made easy: use F = C x 9/5 + 32, with worked examples both ways, a quick mental trick, and key reference temperatures to remember.

Convert between number bases the easy way. Turn binary, decimal, and hex into each other using place values and the divide-by-base method, with worked examples.

Exponents and scientific notation explained simply: an exponent is repeated multiplication, and scientific notation writes big or small numbers as m x 10^n.

How to simplify fractions: divide the top and bottom by their greatest common factor (GCF) to reach lowest terms. See 12/18 = 2/3 worked out step by step.

LCM and GCF explained clearly. Learn the fastest methods with prime factorization, see worked examples, and use the LCM x GCF = a x b shortcut to check.

Learn how to solve a quadratic equation three ways: by factoring, with the quadratic formula, and by reading the discriminant. Clear worked examples included.