Hi There!
This number written as a decimal is 3.45 . Please note, whenever a fraction has a denominator of 100 and a positive numerator, then the numerator will be the decimal.
Steps
1. [tex] \frac{45}{100} [/tex] = 0.45
2. 3 is the whole number.
3. 3[tex] \frac{45}{100} [/tex] = 2/45
In conclusion, 3[tex] \frac{45}{100} [/tex] written as a decimal is 3.45
Hope this helps Jorge :)