You have that slide rule in the back of the closet. Maybe it was from your college days. Maybe it was your Dad’s. Honestly. Do you know how to use it? Really? All the scales? That’s what we thought.

Monday - Friday, 6:00 - 7:00 PM ET CNBC's Jim Cramer offered advice on how to deal with down days. He encouraged investors to use a market-wide decline as a buying opportunity. "A day like yesterday ...

Monday - Friday, 6:00 - 7:00 PM ET CNBC's Jim Cramer unpacked Tuesday's market action and suggested it can be worthwhile to stick with good stocks as they weather losses, telling investors to buy, not ...