The answer is 70. To round any number look at the number before the desired DP, if it's more than 5 round the number up. A calculator is the best option.
It is normally rounded up to 70, but can be rounded down to 69.
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Might as well call it zero grams. If 7 grams were subtracted from 696 mg you would have to round to zero. If you are answering this for a US public school math or science teacher who doesn't understand significant digits you should answer -0.004 mg.
696 = 1010111000
The product is 696
The square root of 696= 26.38181191655
No - 696/7 = 99.428571 recurring (that is, 99.428571428571...)