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Remembering numbers while performing calculations mentally

Specific question: how can I improve on mentally performing calculations like these : $$(78-59)\times23-8\%\times(270+130)$$ ...
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Mnemonic for centroid of a bounded region

The centroid of a region bounded by two curves is given by: $ \bar{x} = \frac{1}{A}\int_a^b{x\left[f(x)-g(x)\right]dx} $ $ \bar{y} = ...