aren't .7 and .70 the same?

apparently my teacher begs to differ on that. she says .70 is set in the hundreths place. thats dumb. the calculator corrects .70 as the tenths place.

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MasterLee · 56-60, M

It depends. It does make a difference when computing margins of error. If a measurment is only accurate to tenths you cannot assume hundreths.