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sup:
A student estimated the sum 7.95 + 8.11 + 78.5 + 8.05 + 79.4 + 0.815 as: All the numbers begin with a 7 or 8, so use cluster estimation. 8 + 8 + 80 + 8 + 80 + 0.8 = 184.8 Explain why this reasoning is not accurate.
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supie:
\(7.95+8.11+78.5+8.05+79.4+0.815=\) \(16.06+78.5+8.05+79.4+0.815=\) \(94.56+8.05+79.4+0.815=\) \(102.61+79.4+0.815=\) \(182.01+0.815=\) \(\bf 182.825\)
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