The correct phrase is ‘one and a half’ because it follows standard English grammar rules for mixed numbers. A mixed number is a combination of a whole number and a fraction. In the case of ‘one and a half,’ it is a mixed number of a whole number (1) and a fraction 1/2 (half).
Therefore, it is logical to say: two and a half, three and a half, four and a half, five and a half, etc.
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