A number that can be expressed as a simple fraction using two integers. For example, 1.75 can also be expressed as 7/4, but the square root of 2 (√2) cannot be expressed as a fraction, and so is considered an irrational number. Another example of an irrational number is Pi, which starts as 3.14159... and continues infinitely.
rational number
A number that can be expressed as a simple fraction using two integers. For example, 1.75 can also be expressed as 7/4, but the square root of 2 (√2) cannot be expressed as a fraction, and so is considered an irrational number.
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