ATD Level II
Business Mathematics and Statistics glossary
Every term this guide defines, A to Z, each with the chapter that teaches it. Open it when a word in a question is unfamiliar, and test yourself on it in the last week: cover the definition and say it in one sentence.
6 terms from the free first chapter
A
- Algebraic terms and expressions operation
A term is a single number, variable, or product of numbers and variables (e.g. 5x); an expression combines terms with addition or subtraction. Like terms (same variable, same power) can be added or subtracted directly; unlike terms cannot.
Taught in Algebra and relationships
F
- Factorisation
Rewriting an expression as a product of its factors, the reverse of expanding brackets, most often used to simplify an expression or to solve a quadratic equation by setting each factor to zero.
Taught in Algebra and relationships
K
- Known and unknowns (variables)
A known is a fixed value already given in a problem; an unknown (variable), conventionally a letter such as x, represents a value still to be found.
Taught in Algebra and relationships
S
- Simplification of algebraic expressions using BODMAS
BODMAS (Brackets, Orders/indices, Division and Multiplication, Addition and Subtraction) fixes the order operations must be carried out in, so an expression evaluates to one, unambiguous value.
Taught in Algebra and relationships
- Simplification of fractions
An algebraic fraction is simplified by factorising numerator and denominator and cancelling any factor common to both.
Taught in Algebra and relationships
T
- The number line
An ordered visual line representing every real number, negative numbers to the left of zero and positive numbers to the right, used to reason about order, magnitude and distance between values.
Taught in Algebra and relationships
The full glossary adds every term from the other 7 chapters, A to Z, each with the chapter that teaches it.