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Find the value of 31.2 -12.125 with due...

Find the value of 31.2 -12.125 with due consideration of significant figures.

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`31.2-12.125`
Here `31.2` has one decimal place, hence `12.125`is to be rounded off to `1+1=2`decimal places `12.125`is rounded off as `12.12`
`:. 31.2-12.12=19.08`
finally we should have only one decimal place and hence `19.08`is to be rounded off as `19.1`.
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