There is not much that can be done to figure out how to write 34.12 as a fraction, except to literally use what the decimal portion of your number, the .12, means.

Since there are 2 digits in 12, the very last digit is the "100th" decimal place.

So we can just say that .12 is the same as 12/100.

The fraction is not reduced to lowest terms. We can reduce this fraction to lowest
terms by dividing both the numerator and denominator by 4.

Why divide by 4? 4 is the Greatest Common Divisor (GCD)
or Greatest Common Factor (GCF) of the numbers 12 and 100.
So, this fraction reduced to lowest terms is

So your final answer is: 34.12 can be written as the fraction