0.036 The significant figures are indicated by the square brackets 0.0[35550], so we round this part of the figure.
72 is 72.2 rounded to two significant figures.
8468 rounded to 2 significant figures is 8500
0.004560 to two significant figures results in: 0.0046
3800000
It is 640.
1.0
To round 48100231 Joules to two significant figures, you would round it to 48000000 Joules since the first two significant figures are 4 and 8. The trailing zeros are not significant.
72.8 round to two is 73.
2.6
93
If you are rounding off to two significant figures the result is 33.Sixes always round up to the next higher digit i.e.296 to two significant figures is 30 *101