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OpenStudy (anonymous):
follow principles of estimation to find an approximate value. round each number so that there is one nonzero digit do not find the exact value 4423 * 4997 thanks in advance
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OpenStudy (ybarrap):
4423*4997 is about (4000 + 423)(5000) =(4000*5000 + 423*5000) which is about 20,000,000 + 2,000,000=22,000,000 Compare this to the actual answer of 22,101,731. Not too bad!
OpenStudy (ybarrap):
Note that I used 400 instead of 423 above
OpenStudy (anonymous):
by rounding down to the nearest digit?
OpenStudy (ybarrap):
Yes
OpenStudy (anonymous):
much appreciated thank you nicely explained
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OpenStudy (ybarrap):
NP
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