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Front End Estimation can be confusing before you understand it. There are two simple steps for front end estimation: add the digits of the two highest place values, insert zeros for the other place values. Now let's put that into us for your question!

189-643 =

(1 & 8 are the first two digits for 189 ... 6 & 4 are the first two digits for 643)

18_ - 64_ =

(Fill in zeros for the place values you have emptied)

180-640= -460

-460Q: What is the front end estimation to subtract 189 from 643?

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400

explain how you would estimate to subtrac 189 from 643

189 rounded up to the nearest 100 number would be 200; 200 subtracted from 643 = 443 , 200 - 189 454

643 - 189 = 454

643

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400

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450

500

explain how you would estimate to subtrac 189 from 643

189 rounded up to the nearest 100 number would be 200; 200 subtracted from 643 = 443 , 200 - 189 454

640 - 190 = 450

643 - 189 = 454

643 is a prime number. So its factors are 1 and 643.

75 of 643 is 48,225. 75% of 643 is 482.25

1 and 643

six hundred and forty-three 6,430 / 10 = 643