The many ways to compute in EM

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The many ways to compute in EM; estimate; ignore the decimal point
Topic Started: Mar 27 2009, 09:18 AM (104 Views)
IlikeLIvonia	Mar 27 2009, 09:18 AM Post #1
Advanced Member Posts: 923 Group: Members Member #44 Joined: May 11, 2007	http://www.alexandria.k12.mn.us/1129108151658890/lib/1129108151658890/Math%20Algorithms.pdf Lattice multiplication with decimals, page 5 Division of decimals, page 9: Ex: 97.24/23=? Step 1: Estimate the quotient. 97.24 is about 100, and 23 is about 25. 100/25=4, so 97.24/23 should be about 4. Step 2: Divide, using the partial quotients method, ignoring the decimal point. If there is a remainder, rewrite the remainder as a fraction. Then round the answer to the nearest whole number (9724/23=422 18/23=423). Step 3: Use the estimate from step 1 to place the decimal point. Since the estimate is that the quotient should be about 4, the decimal should be placed between the 4 and the 2 in 423. So, 97.24/23=4.23 Edited by IlikeLIvonia, Mar 27 2009, 09:34 AM.



IlikeLIvonia	Mar 27 2009, 09:16 PM Post #2
Advanced Member Posts: 923 Group: Members Member #44 Joined: May 11, 2007	8.25/0.3=? Step 1: Estimate the quotient. 8.25 is about 8 and 0.3 is about 1/3. Think: how many 1/3s are in 8? If each of 8 pieces is divided into thirds, there will be 24 pieces. So 8 divided by 1/3 =24. And 8.25/0.3 should be about 24. Step 2: Divide, using partial quotient method, ignoring the decimal points. Step 3: Use the estimate from step 1 to place the decimal point. Since the estimate was about 24, place the decimal point between the 7 and the 5 in 275. So, 8.25/0.3=27.5



Mrs.M	Mar 28 2009, 08:53 AM Post #3
Advanced Member Posts: 1,071 Group: Members Member #29 Joined: May 10, 2007	My son said he just solves the math problems the real way. And this too (EDM) shall pass. http://en.wikipedia.org/wiki/This_too_shall_pass



Whatever	Mar 28 2009, 09:52 AM Post #4
Advanced Member Posts: 595 Group: Members Member #206 Joined: June 4, 2007	Would you want your Dr., pharmacist, or nurse to use these methods to calculate your medication? I suspect they think most kids will not pursue a math-related career or they wouldn't be teaching it this way. Edited by Whatever, Mar 28 2009, 10:10 AM.


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