The rule is - whatever number of decimal places you're rounding off to - look at the NEXT number...
For example - round 23.456 to two decimal places. The number in the THIRD decimal place is 5 or more so you round UP to get 23.46.
IF the number had been 23.454, you would round DOWN to yield 23.45.
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There are 2 or 3 significant figures. It could be 894° rounded to 2 significant figures; It could be 889.6° rounded to 3 significant figures.
188,100 rounded to two significant figures is 190,000
There are two types of significant figures, measured and exact. Numbers are often rounded to avoid reporting insignificant figures. Numbers can also be rounded merely for simplicity rather than to indicate a given precision of measurement.
To one significant figure 7 Rounded off to two significant figures (tenths in your example) 7.4
Expressed as a decimal, rounded to three significant figures, 9/981 = 0.00917