Best Answer

Non-zero numbers are always significant and leading zeros are never significant. So 0.007222 has 4 significant figures so rounding to 3 would give you 0.00722.

Q: How do you round 0.007222 into 3 significant figures?

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17.9867 to 3 significant figures is 18.0

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It is 1570000 rounded to 3 significant figures