Question 16: Quick calculation: 199 + 36 + 201 + 184 + 37 has the result

We have:

\(\begin{array}{l}199 + 36 + 201 + 184 + 37\\ = \left( {199 + 201} \right) + \left( {36 + 184} \right) + 37\\ = 400 + 220 + 37\\ = 620 + 37\\ = 657\end{array}\)

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