how you would estimate to subtract 189 from 643
Estimate 189 to the nearest tenth which would be 190. And then do the same for 643 which would be 640. 640-190= 450
643-189=450 bevause when you subtract you get 454 and if you are estimating you are rounding and it has a digit 4 in the ones place so you would have to round down because it is not 5 or more
SO MY FINAL ANSWER TO YOU IS 4⃣5⃣3⃣