Page 33 - Basic Math Principles_Neat

Significant Figures and Rounding Numbers cont.

For example, here is a 24-hour average reading for combined filter turbidity from

the plant SCADA of a surface water treatment facility—0.0345 NTU.

However, the state’s Monthly Operating Report does not allow entries greater than 2

decimal place values or recognize numbers beyond the hundredths place.

Therefore, the plant manager will record 0.035 NTU for that day. She rounds 0.345

up to 0.35 because there is a 5 in the thousandths place.

The previous daily average reading was 0.0412 NTU, therefore, she rounds to the

hundredths place as required and records 0.041 NTU in the MOR.