mathinschool.com
numbers and algebraic expressions
logic, sets, intervals
absolute value
function and its properties
linear function
quadratic function
polynomials
rational function
exponential function
logarithm
number sequences
limits of sequences and functions
derivative and integral of functions
trigonometry
plane geometry
analytic geometry
solid geometry
combinatorics
probability
elements of statistics
kropki game

GCD(a,b) - greatest common divisor of numbers a, b. Examples: GCD(20,30) = 10. 10 is the largest number that divides 20 i 30. GCD(45,60) = 15. 15 is the largest number that divides 45 i 60. LCM(a,b) - least common multiple of numbers a, b. Examples: LCM(20,30) = 60. 60 is the least number that can be divided by 20 and 30. LCM(45,60) = 180. 180 is the least number that can be divided by 45 and 60.