189 rounded up to the nearest 100 number would be 200;
200 subtracted from 643 = 443 ,
200 - 189 454
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explain how you would estimate to subtrac 189 from 643
400
643 - 189 = 454
Oh, dude, front end estimation is like when you round numbers to make math easier, right? So, if you wanna subtract 189 from 643 using front end estimation, you could round 643 to 600 and 189 to 200, then subtract 200 from 600 to get 400. But like, who needs estimation when you can just do the actual math, am I right?
To find out how many times 5 goes into 3215, you would perform division. 3215 divided by 5 equals 643 with a remainder of 0. Therefore, 5 goes into 3215 exactly 643 times.