solve the in
inequality 120-11 33.
or
2010
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Answer: Mental calculation comprises of arithmetical calculations using only the human brain, with no help from any supplies (such as pencil and paper) or devices such as a calculator. People use mental calculation when computing tools are not available, when it is faster than other means of calculation (such as conventional educational institution methods), or even in a competitive context. Mental calculation often involves the use of specific techniques devised for specific types of problems.[1] People with unusually high ability to perform mental calculations are called mental calculators or lightning calculators.
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