Need some math words that start with I?

From Improper Fraction and Isosceles Triangle to Invariant and Integer, there are some useful math-related words beginning with the letter I.

Here is a list of some of the words I was able to find beginning with I:

## Math Words That Start With I

**Improper Fraction** – a fraction whose numerator is equal to, larger than, or of equal or higher degree than the denominator.

**Interval **– a set of real numbers between two given numbers called the endpoints of the interval.

**Intersect **– the intersection of two sets A and B, denoted by {\displaystyle A\cap B, } is the set containing all elements of A that also belong to B or equivalently, all elements of B that also belong to A.

**Inverse **– Inverse operations are pairs of mathematical manipulations in which one operation undoes the action of the other.

**Isosceles Triangle** – a triangle that has two sides of equal length.

**Inch **– a unit of length in the customary system of measurement.

**Intersection Lines** – a single point where two lines meet or cross each other.

**Inequality **– a statement of an order relationship—greater than, greater than or equal to, less than, or less than or equal to—between two numbers or algebraic expressions.

**Invariant **– a property of a mathematical object which remains unchanged after operations or transformations of a certain type are applied to the objects.

**Investing **– the act of allocating resources, usually money, with the expectation of generating an income or profit.

**Irrational Number** – the irrational numbers are all the real numbers which are not rational numbers. That is, irrational numbers cannot be expressed as the ratio of two integers.

**Irregular Polygon** – polygons that have unequal angles and unequal sides, as opposed to regular polygons which are polygons that have equal sides and equal angles.

**Isometric **– an isometry (or congruence, or congruent transformation) is a distance-preserving transformation between metric spaces, usually assumed to be bijective.

**Iteration **– the repeated application of a function or process in which the output of each step is used as the input for the next iteration.

**Interquartile Range** – the difference between smallest value and the largest value of the middle 50% of a set of data.

**Interpolation **– a type of estimation, a method of constructing new data points based on the range of a discrete set of known data points.

**Interior Angle** – the inner of the two angles formed where two sides of a polygon come together.

**Interest **– a process in which an amount of money borrowed or lent increases over time.

**Inradius **– The radius of the largest circle that will fit inside any given geometric shape, especially inside a regular polygon.

**Inscribe **– A geometric figure which touches only the sides (or interior) of another figure.

**Increase **– become or make greater in size, amount, or degree.

**Increment **– a small positive or negative change in a variable quantity or function.

**Independent Variable** – a variable (often denoted by x ) whose variation does not depend on that of another.

**Infinite **– greater than any assignable quantity or countable number.

**Inflation **– the rate of increase in prices over a given period of time.

**Impossible Event** – an event that cannot happen.

**Integers **– a number which is not a fraction; a whole number.

I hope you found the words you were looking for from the list above.

This isn’t an exhaustive list, if there are any math words starting with the letter I that you would like added to the list, please leave me a comment below.

If you’d like to explore more math words starting with different letters of the alphabet, click any of the letters below to go to the list for that letter:

*Image credits – Photo by Joshua Hoehne on Unsplash*