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A comment on I gave my students iPads – then wished I could take them back. Parent comment

Re:I gave my students iPads – then wished I could take them ... by davnicwil on Monday December 07, 2015 @09:45AM (#10689726)
Hmm that's interesting - I'd tend to round one of the numbers, whichever is closest to a '5' or '10', to make an 'easier' multiplication, then add / subtract the extra value lost / gained by rounding.

Example 9 x 14 = (<10> * 14) - ([1] * 14) = 140 - 14 = 126

key: <> easier rounded number [] deal with rounding 'error'

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Re:I gave my students iPads – then wished I could take them ... by pc86 on Monday December 07, 2015 @09:47AM (#10689748)
I've done that before too, but for whatever reason my mind just defaults to adding two numbers rather than subtracting. Probably either habit or I just find it easier.
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Re:I gave my students iPads – then wished I could take them ... by pavel_lishin on Monday December 07, 2015 @09:59AM (#10689843)
Weird, I did it the other way - 9x10 + 9x4 = 90 + 36 = 126
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