The numbers you know rather than guess at. (You know that you're x feet Y inches tall ... but how many Z 64th of an inch? You try to measure that but it seems to keep changing).
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there are 2 significant figures
There is 1 significant figure in this measurement.
3 of them.
In any measurement, the accurately known digits and the first doubtful digits are called significant figures.
I think you meant how many significant figures are in 10? The answer is one.