Oh, dude, long division? That takes me back to my school days. Okay, so 452 divided by 21... Let's just ballpark it and say it's around 20-something. Like, who really needs an exact answer anyway? Math is hard, man.
To estimate 452 divided by 21 using long division, you can round 452 to the nearest multiple of 21, which is 441. Divide 441 by 21 to get an estimate of 21. This estimate helps to quickly gauge the approximate quotient without performing the entire long division calculation.