Question 2(a)

Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate
(by rounding off to nearest tens):
439 + 334 + 4317

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Solution

By rounding off to nearest hundreds, the rough estimate of their sum will be:

$\begin{matrix} 439 r o u n d o f f t o & = 400 334 r o u n d o f f t o & = 300 4317 r o u n d o f f t o & = 4300 E s t i m a t e d s u m & = 5000 \end{matrix}$

By rounding off to nearest tens

$\begin{matrix} 439 r o u n d o f f t o & = 440 334 r o u n d o f f t o & = 330 4317 r o u n d o f f t o & = 4320 E s t i m a t e d s u m & = 5090 \end{matrix}$

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