How do you round 139 to the nearest hundred?

Oh, dude, rounding 139 to the nearest hundred is like deciding if you want to tip 15% or 20% at a restaurant. You look at the last two digits - in this case, the "39" - and since it's less than 50, you keep the hundreds digit the same, making it 100. It's like when you're running late and just round up the time to make it seem like you're not that late.