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 +, - EnchantedLearning.comMath Dictionary x, ÷
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 I is for ...
 II equals 1 in Roman numerals. ii is an imaginary number, defined as the square root of negative one. icosahedronAn icosahedron is a twenty-sided geometric solid. 0identity for additionThe additive identity is the number zero because zero plus any number is equal to the original number. For example, 2 + 0 = 0 + 2 = 2.
 1identity for multiplicationThe identity for multiplication (also called the multiplicative identity) is one, because a times 1 = 1 times a = a. For example, 2 times 1 = 1 times 2 = 2. illusionAn illusion is something that tricks your eyes. iimaginary numberAn imaginary number is a number of the form bi, where i is the square root of negative one and b is a real number. improper fractionAn improper fraction is one whose numerator is larger than the denominator (like 5/4). Improper fractions can be written as a mixed number, a number plus a fraction (5/4 = 1 1/4).

inch

An inch is a unit of measurement that is equal to one-twelfth of a foot. The symbol for inch is ".
 = Equal 1 = 1 > Greater Than 2 > 1 < Less Than 1 < 3

inequality

An inequality is a mathematical expression that contains an inequality symbol. The inequality symbols are :

< less than (1<2)
> greater than (2>1)
≤ less than or equal to
≥ greater than or equal to
≠ not equal to (1≠2).

infinity

Infinity is a concept of endlessness. The symbol above represents infinity.
 integerThe integers are the numbers ..., -3, -2, -1, 0, 1, 2, .... intersectionAn intersection is where two or more things, like roads or sets, meet or overlap. The intersection of two sets is the set of objects that belong to both of the original sets. inverse property of additionThe inverse property of addition states that for every number a, a + (-a) = 0 (zero). inverse property of multiplicationThe inverse property of multiplication states that for every non-zero number a, a times (1/a) = 1.
 irrational numberAn irrational number is a number that cannot be written as a fraction (like a/b, where a and b are whole numbers and b is ≠ 0). For example, the square root of 2 is an irrational number. isosceles triangleAn isosceles triangle has two sides that are the same length and two angles that are the same.

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 Number Line Fractions Decimals Graphs Measurement Rounding

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