12.42 is a fraction. It is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, is 1242/100. You can simplify this rational fraction if you require.
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To determine if 1242 is divisible by 23, you would perform the division 1242 ÷ 23. The quotient is approximately 54.08696. Since the quotient is not a whole number, 1242 is not evenly divisible by 23.
The PF of 1242 is: 2 x 3 x 3 x 3 x 23
1000 = M, 200 = CC, 40 = XL and 2 =II, so 1242 would be written as MCCXLII
6n-1248 = -1242
456 plus what equals 1242.\