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Mathematics 6.

Table of contents
Index of new concepts
angle bisector • It is a ray originating from the vertex of an angle that divides the angle into two equal parts.

combining • The addition and subtraction of numbers with signs is called combining.

common factor, greatest common factorThe common factors of two numbers are factors of both numbers. The largest of the common factors is called the greatest common factor.

common multiple, lowest common multiple • The common multiples of two numbers are multiples of both numbers. The smallest positive common multiple is called the lowest common multiple of the two numbers.

composite number • Natural numbers greater than \latex{ 1 } that have more than two factors.

kite • A quadrilateral with two pairs of adjacent sides that are equal in length.

direct proportion • Two variables are directly proportional if one increases, then the other also increases by the same amount.

factor, multiple • Natural number \latex{ a } is a factor of natural number \latex{ b } (natural number \latex{ b } is a multiple of natural number \latex{ a }) if there is a natural number \latex{ k } that, when multiplied by \latex{ a }, gives \latex{ b }, that is, \latex{ k × a = b }.

inverse proportion • Two variables are inversely proportional if one of them increases and the other decreases by the same amount.

isosceles trapezium • A trapezium that has two pairs of adjacent equal angles.

isosceles triangle • A triangle with two sides of equal length.

percentage • The \latex{\frac{1}{100}}th part of a number is called \latex{ 1 }%, while the \latex{\frac{100}{100}}th part is called \latex{ 100}%.

perpendicular bisector • The perpendicular bisector of a line segment is a line perpendicular to the line segment that crosses the midpoint of the line segment.

prime number • Natural numbers that have exactly two factors.

ratio • The ratio of two numbers is the quotient of two numbers.

rational numbers • Numbers that can be expressed as the quotient of two integers.

reciprocal • If the product of two numbers is \latex{ 1 }, they are reciprocals of each other.

regular polygon • Polygons with sides of equal length and equal angles.

equilateral triangle • A triangle whose sides are equal in length.

relative primes, coprimes • If two numbers do not have a common prime factor, their greatest common factor is \latex{ 1 }. These numbers are called coprimes (relative primes).

rhombus • A quadrilateral whose sides are equal in length.

trapezium • A quadrilateral with a pair of parallel sides.