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Long Division Help, please

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Long Division Help, please
Old 10-25-2018, 11:11 AM
 
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5th grade teachers, how are you teaching long division with 2 digit divisors?
Which method do you use?
Thanks,
Dee



Last edited by Tulips; 10-25-2018 at 09:15 PM..
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Old 10-25-2018, 03:22 PM
 
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We have them ask themselves where the divisor will fit, then put xís over those numbers so they know how many digits will be in their answer. We try to model some estimation skills, but for kids who arenít good at that, we have them go off to the side and start trying to multiply the divisor by some numbers to get an idea of how many times it will fit. We encourage them to not erase any trials because they may be able to use them later in the problem. It takes them awhile, but they can get there.
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Old 10-25-2018, 09:10 PM
 
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1. round the divisor and find a compatible number for the first 2 digits in dividend, estimate

2. estimate gives you an idea where to start

3. create a ratio table (i usually start it for them) for the dividend; for example, i have them start with 1 and 23, then 10 and 230, then 100 and 2300, then 50 and then 2 and then 20....hope that makes sense

4. now they can use estimate and the ratio table to start subtracting (partial quotients) with the largest number they....

visual (not mine): https://www.google.com/search?biw=13...ui6nCDTn_MaVM:

(the green writing isn't quite like what i do, but...)
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Thanks!
Old 10-25-2018, 09:14 PM
 
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I know the standard doesn't say traditional algorithm, but that's what the other 5th grade teachers at my site are doing, so I'm wondering what others do. Thanks for the visual, Tia, and the tips Spedhed.
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different methods
Old 10-26-2018, 03:42 PM
 
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I show them repeated subtraction so that they WANT some other method. I also teach generic rectangles and finish up with the standard algorithm.


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