Author Topic: Inversely proportional to square root  (Read 1849 times)

Re: Inversely proportional to square root
« Reply #25 on: December 12, 2019, 05:13:41 pm »
I find multiplying by 16 (repeated doubling) then divide by 10 (shift the decimal point or knock a zero off) easier if I'm feeling tired.

CrazyEnglishTriathlete

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Re: Inversely proportional to square root
« Reply #26 on: December 12, 2019, 06:16:57 pm »
My GPS device has decided to reset itself to Miles rather than Km, and I've been busy telling myself I only have 30 miles to go...
Eddington Numbers 125 (imperial), 175 (metric) 528 (furlongs)  112 (nautical miles)

Re: Inversely proportional to square root
« Reply #27 on: December 13, 2019, 08:18:03 pm »
I won't tell my son I haven't done one since I was 16!
Is it possible to do one simultaneous equation? I thought that wasn't the point? ;D

zigzag

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Re: Inversely proportional to square root
« Reply #28 on: December 13, 2019, 10:45:47 pm »
my on-the-go method of converting miles to km - multiply by 1.5 and add a bit

for reverse calculation - multiply by 2/3 and subtract a bit

very easy and good enough to get a good idea about the distance

Pingu

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Re: Inversely proportional to square root
« Reply #29 on: December 14, 2019, 04:36:46 pm »
For miles to Km I multiply by 8 then divide by 5. checking road signs against the route sheet is a good way to keep awake.

This. I have done it lots  :)