80 has 1 significant figure.
Four.
It has three significant figures
Has 5 significant figues.
Five
3 Significant figues are any other number apart from 0
45.00
One.
It is: 23,010
190,000
There are 304.8 millimetres in one foot. Therefore, rounded to three significant figures, 80 millimetres is equal to 80/304.8 = 0.262 feet.
.80 there are 2 significant figures
The answer depends on the accuracy ot your "eighty percent"!269 * 0.8000 = 215.2 ( Four significant figures )If the "80 percent" is accurate to three significant figures (should have been written 80.0%): 215If the "80 percent" is only accurate to two significant figures: 220or if the "80 percent" is only accurate to one significant figure: 200