Final answer:
The ratio 103 to 213 in fractional notation is written as 103/213 without any simplification.
Step-by-step explanation:
The ratio 103 to 213 in fractional notation is written by placing the first number, the antecedent, above the second number, the consequent, in a fraction format, with the first number as the numerator and the second as the denominator. Thus, the fraction form of the ratio 103 to 213 is 103/213.
When we write ratios as fractions, we do not simplify unless specifically instructed to do so. Therefore, in this case, the ratio is left in its original form as 103/213, without simplifying.