necessary correction can be made to find the correct measurement
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we can find the zero error by closing the jaw of screw guage if the zero of main scale(MS) is concide with the zero of circular scale (CS) there is no zero error and if they are not concide there is a zero error in screw guage .
the charateristics of zero pairs is that you have to always end to 0 ,if not then it is not a zero pair .you could use counter chips to help you understand it better
When you're quotient is in the hundredths place or more or when you're dividend or divisor has a placeholder zero as well.
The first people to use the decimal system and the number zero WERE NOT THE CHINESE! I am learning about this in school. The ancient Hindu's invented them during the Gupta Empire.
You will include zero in finding an average if it is present in the problem. For example, you want to average quiz scores of 75, 100, 90, 0, 80. You would include zero. If zero isn't listed, don't use it.