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explain how you would estimate to subtrac 189 from 643
I estimate 20000 because 19724 is closer to 20000 than it is to 10000
Although there is a method similar to long division, it is rather difficult to explain. So the best ways are: Use a calculator. or Use trial and error to get a rough estimate and improve on it.
It's counter-productive to think of estimates as correct or incorrect since estimates, by definition, are not supposed to be correct but that way of thinking will seriously annoy your teacher. Here's what the teacher wants to hear: Fern's estimate is incorrect since she should have rounded 548 up to 550 and got 420. That estimate is closer to the actual difference. Fern is a tragically misguided girl.
Explain how to disentangle hair after shampooing and explain the importance of considering the cuticle scales: