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How do I get an answer right without writing it down with pencil or paper?

How do I get an answer right without writing it down with pencil or paper?
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4 votes
How do I get an answer right without writing it down with pencil or paper?

User Jonathan Holvey
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8.5k points

1 Answer

3 votes
We can think or calculate in or mind
User Porkbutts
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7.9k points
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