Adding extra text so that i can post this question

It’s the third option: 0.12, 0.34, 0.695, 0.9

One way to think about decimals is as fractions:
0.12 is 12/100
0.34 is 34/100
0.695 is 695/1000
0.9 is 9/10
When you make them all have common denominators, you can easily compare which are bigger. I’ll have the common denominator be 1000:
12/100 x 10 = 120/1000
34/100 x 10 = 340/1000
695/1000
9/10 x 100 = 900/1000
When you look at it this way, it’s quite obvious which are the bigger number.
Of course, you don’t need to write this all out, but thats the reasoning behind it.