Is 0.10 rational

Well, honey, let me break it down for you - a rational number is any number that can be expressed as a fraction. So, if you can write 0.10 as a fraction (like 1/10), then it's rational. And guess what? 0.10 can be written as 1/10, so yes, it's rational. But hey, don't lose sleep over it - it's just math, not a soap Opera.