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phdprospect
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try doing math in your head and just jog down intermediate numbers if needed.
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nonameee
How much time do calculations on paper take?

I think this really depend on how you practice and how well you know math. Some folks will be able to do a lot of calculations in their heads without messing up and some will have to write everything down. However you are, you should practice as such. I don't think any math questions on the GMAT should really make you spend more than 2 minutes in writing calculations. If that's the case, you should practice more on your basic maths, such as multiplication and division.
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i think the places where you find yourself needing to use "heavy" calculations are:

1. figuring out a square root that you shouldve memorized
2. using plugin but not using easy to work with numbers
3. trying to find a huge number in a large sequence without finding some way to reduce it
4. forgetting some interest formulas so you have to multiply the years/months out.

Theres probably a few more but most of the time if you know the shortcuts you really dont need to do much calculation at all.
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