Two - all nonzero numbers are significant.
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When adding or subtracting measurements, the result should be rounded to the least number of decimal places of any measurement involved in the calculation. This is to maintain the same level of precision as the least precise measurement.
There are approximately 4.33 inches in 11 centimeters.
A sodium atom has an atomic number of 11. This means it has 11 protons in its nucleus.
Take That has had 12 number 1 singles in the UK.
The atomic number for sodium is 11.