Question

# The length, $l$ meters, of a garden is 78.5m, correct to the nearest half meter.Correct this statement about the value of $l$.$................... \leqslant l \leqslant ...............$

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Hint: Add & subtract half meter to get the range.

So, the range of length of the garden can be written as $\left( {78.5 \pm \dfrac{1}{2}} \right)m$
${l}_{1} = 78.5 - \dfrac{1}{2} = 78.5 - 0.5 = 78m \\ {l}_{2} = 78.5 + \dfrac{1}{2} = 78.5 + 0.5 = 79m \\$
Therefore length $\left( l \right)$ of garden correct up to half meter is written as
$78 \leqslant l \leqslant 79$