Mathematics for IGCSE & O level - Using A Calculator (Section 2 - No. 41)
If your calculator displays the answer to a calculation as 2.33333..., what should you do to express this number more accurately?
Leave it as is.
Round it to the nearest whole number.
Try to convert it to a fraction like 2 1/3 or 7/3.
Change it into standard form.
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Repeating decimals are best represented as fractions for greater accuracy.