I
- Identity equation
- Identity property
- Imperial units
- Impossibility
- Impossible event
- Improper fraction
- Inch
- Independent events
- Independent variable
- Index notation
- Indirect comparison
- Inductive reasoning
- Inequality
- Initial value
- Input
- Input-output table
- Integer
- Intercept
- Interior
- Interpretation of remainder
- Interquartile range
- Intersecting lines
- Intersection of sets
- Interval
- Invariant
- Inverse operations
- Inverse proportion
- Inverse relationship
- Irrational number
- Isosceles triangle
- Iteration