Use a calculator for things that you know how to solve but they'll take longer to do on paper and time is wasted. Use paper for when you're learning something new. Once you understand it, you may use a calculator for long problems in that area.
use calc for easy calculations (like 3452*235) and use paper to keep track of where u are on the problem and to show your work. also, alway set up the problem on paper and work downwards,simplifying after every step
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