Okay, so your dad is away for the weekend, and so the usual 10 p.m. quietness rules don't apply. Your older siblings have just been doing algebra, amidst much hilarity, and are now bouncing on the minitramp with your little sister, making up ridiculous stories and using wacky theatrical voices. You really want to do some math too, but wow, is it ever hard to concentrate! Especially considering that you're doing a section on computing and rounding off repeating decimals from a variety of fractions and mixed numbers. Argghh.
No fear, though. A solution is close at hand. You only need to don the Super-Sonic Smartness goggles. With them on you will be able to solve any problem.
That is, provided you and your siblings can stop laughing your crazy heads off over your bizzare combination of blue nightgown and ski goggles.