19 entries

Maths words beginning with D

Data: Pieces of information that have been collected, such as counts, measurements or answers to a question.
Decimal: A number written using place value with a decimal point, where digits to the right of the point represent tenths, hundredths, thousandths and so on.
Decimal point: The dot in a decimal that separates the whole-number part from the parts smaller than one.
Degree: A unit for measuring angles, equal to $\frac{1}{360}$ of a full turn and written with the symbol $^\circ$ .
Degree Celsius: The unit of temperature on a scale where water freezes at $0$ and boils at $100$ .
Denominator: The bottom number of a fraction. It tells you how many equal parts the whole is divided into.
Derivative: The instantaneous rate of change of a function, equal to the gradient of its graph at a point. Written $f'(x)$ or $\frac{dy}{dx}$ .
Diagonal: A straight line joining two corners of a polygon that are not neighbours.
Diameter: A straight line through the centre of a circle from one side to the other, or its length. It is twice the radius.
Digit: One of the ten symbols $0, 1, 2, 3, 4, 5, 6, 7, 8, 9$ used to write numbers. A number can be made of one digit or many, and each digit is worth a different amount depending on its place.
Discount: An amount or percentage taken off a price.
Discriminant: The expression $b^2 - 4ac$ from the quadratic formula. Its sign tells you how many real solutions a quadratic equation has.
Distance: How far apart two places are, or how far something has travelled.
Dividend: The number that is being divided.
Division: Splitting a total into equal shares or equal groups. It is the inverse of multiplication.
Divisor: The number you divide by.
Domain: The set of input values for which a function is defined.
Dot plot: A chart with one dot for each item, stacked above its value on a number line.
Duration: The length of time between a start time and an end time.