It is: 1 and 29/100
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12.225 = 129/40
129 is divisible by three, hence it is a composite number.
No, 129 is not a prime number. A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers. In the case of 129, it can be factored as 3 x 43, so it is not prime.
It is: 6.17 = 6 and 17/100 as a mixed number
The mixed number is: 3 87/100