Decimals and Exponents can be tough without a calculator, but YOU can learn how to do them quickly!

This video will teach you how to quickly solve examples such as (0.3)^2 and (0.05)^3 without a calculator!

Save precious time on your MCAT practice and time on you official exam by mastering this MCAT Math Trick!

(Watch on YouTube: Decimals & Exponents. Click CC for Transcription.)

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Iraina says

I have a hard time using the gas constant without a calculator.

Say that I am using the equation PV=nRT, where R= 0.0821

I always round 0.0821 to just 0.08. But multiplying numbers by 0.08 is difficult. Is there an easy way to do this?

Example (0.25 mol)(0.08 L∙atm∙mol−1∙K−1)(300) / 3 atm = V

I cannot do this without a calc. I tried rounding 0.08 to 0.1, and the answers are so far off that I can’t answer them correctly.