I

improper fraction

A fraction where the numerator is greater than or equal to the denominator; e.g., , , and are improper fractions.

pages 70–73, 468–469, 470–473, 475, 477–478, 497, 513

infinite

Never ending, immeasurably great, unlimited.

page 149

interpolate (interpolation)

Making predictions or estimating values that lie between data points in a set of data. (See also extrapolate.)

pages 521, 545, 549, 555

inverse operations

Operations that undo each other. For example, addition and subtraction are inverse operations and multiplication and division are inverse operations.

isosceles

Having two equal sides. Often used to describe a triangle with two equal sides and two equal angles.

pages 283–284