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One
0.0816
140 This is because you take the first two numbers (in this case, they are 100 and 30) and these are the first two figures. You then round the 30 to a 40, because of the 8. This then gives you 140.
170 - (40%) = 102
40% =0.44/102/5
One
jku
There are three. The 4, the 5 and the zero in between. The two last zeros serve only to properly space the decimal point which, in this number, is implied.
0.0816
There are 1609.344 metres in one mile. Therefore, rounded to three significant figures, 40 metres is equal to 40/1609.344 = 0.0249 miles.
both 40 and 400 have one because there is no "." the 0.7000 has four SF because you know that the first three digits after the seven are exact while the last zero could be rounded. the concept is a little tough to get but once you do its pretty simple.
20.8333
A, B and D.
140 This is because you take the first two numbers (in this case, they are 100 and 30) and these are the first two figures. You then round the 30 to a 40, because of the 8. This then gives you 140.
170 - (40%) = 102
The decimal part of 40 is 40 so the answer is 4080.
40% =0.44/102/5