0.06
1686 rounded to 2 significant figures is 1700
223.4*7.5=1675.5=1700(sf) There are two significant figures
1700
In multiplication you use the lowest number of sig figs. if one number has 3 and the other has 5 the answer should be held to 3 digits. If one has a leading zero ( 0.123) the zero is ignored and the sig figs would be 3.Added:So the answer to the question "How many significant figures will there be in the answer to 223.4times7.5" is to be TWO in the answer of this multiplication (not 1675.5, not 1700, but 1.7*103)
10.3235
20
0.6667
0.1082
141.6667
425
28.3333
669.2913