Yes, sometimes I use a calculator for really simple stuff just to double check!

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It's a must

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Yep

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yea my brain isn't always the best

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Even when I do, I still go back to the old fashion way!

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Fingers

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with the simple tasks i use my brain but with the full big tasks really use it and sooooo much ^^

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Rarely, I prefer to do math in my head.

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