2 and 1/2 as a decimal is 2.5
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One half is 1/2, which is 0.5 written as a decimal. 3 and (plus) 0.5 is 3.5. So 3 and one half is written 3.5
1/2 = .5 1/2 is a half a whole, and one whole number is 1. so half is 0.5
A half which is 1/2 is 0.5 as a decimal
One half (1/2) can be expressed as 0.5 as adecimal and 50% as a percent.
1/2 = a half .5 = a half