Question

How many significant figures are there in each of the following measurements

23
1.498
283.3
9.855
76.414
32.8
107
0.238
8.0335
0.05587
307
1.40082
0.00058900
4500
350000
180.0

Answer 1

Significant figures is the number of figures starting from the first non-zero number.
23 = 2 s.f.
1.498 = 4 s.f.
283.3 = 4 s.f.
9.855 = 4 s.f.
76.414 = 5 s.f.