Writing as a mixed number in general means a whole number and fraction, so lets take your first decimal

7.79

THis is already nearly in the form of a mixed number as decimals are fractions of 100, 1000, 10000 depending on the number of decimal places. Here as there are two numbers after the decimal point, it is a fraction of 100

so 7.79 can be written as 7 79/100

When possible, simplify the fraction to its lowest form such as your last example

3.6 is 3 6/10 or 3 3/5

Here I have done two of your examples, I hope it is clear enough so you can work on the other three.

I hope this hleps

7.79

THis is already nearly in the form of a mixed number as decimals are fractions of 100, 1000, 10000 depending on the number of decimal places. Here as there are two numbers after the decimal point, it is a fraction of 100

so 7.79 can be written as 7 79/100

When possible, simplify the fraction to its lowest form such as your last example

3.6 is 3 6/10 or 3 3/5

Here I have done two of your examples, I hope it is clear enough so you can work on the other three.

I hope this hleps