## MATHS GLOSSARY

### Summary of Key Terms

**Acute angle** - any angle less than 90 degrees.

**Angle** - a measure of space between two intersecting lines.

**Arithmetic mean** - sum of all the items divided by the number of items.

**Bearing** - a measure of location on a compass.

**Circumference** - boundary or perimeter of a circle.

**Correlation** - a mutual connection between two variables.

**Denominator** - the bottom part of a fraction. Hint: it is down under the numerator.

**Diameter** - distance across a circle through the centre giving its width.

**Factor** - a number that divides exactly into another number.

**Gradient** - the steepness of the slope of a line.

**Hypotenuse** - the longest side of a right-angled triangle.

**Improper fraction** - a fraction having the numerator higher than the denominator.

**Modulo** - a remainder value when two numbers are divided. The modulo function is given as a mod b, where a and b are two numbers. For example 16 divided by 3 gives 5 remainder 1, which can be expressed as 16 mod 3 = 1.

**Negative number** - having a value less than one.

**Numerator** - the top part of a fraction.

**Obtuse** - any angle greater than 90 but less than 180 degrees.

**Percentage** - a fraction multiplied by 100.

**Perimeter** - the total distance around the boundary of a shape.

**Perpendicular** - a line at right angles to another line.

**Prime number** - having only two factors of different values.

**Polygon** - a many-sided shape.

**Quadrilateral** - a plane four-sided shape.

**Quotient** - the result of dividing one number by another. Quotient comes from Latin and means "how many times".

**Radius** - half the diameter of a circle.

**Reflex angle** - any angle greater than 180 degrees.

**Transcendental number** - has a value that cannot be calculated by any combination of addition, subtraction, multiplication, division, or square root extraction such as pi.

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