1. The problem is to convert the decimal number 0.348 to significant figures (s.f). 2. Significant figures refer to the number of meaningful digits in a number, starting from the first non-zero digit. 3. The number 0.348 has three digits: 3, 4, and 8, all of which are significant. 4. Therefore, 0.348 already has 3 significant figures. 5. If you want to round it to fewer significant figures, for example 2 s.f., you round 0.348 to 0.35. 6. If you want to round it to 1 s.f., you round 0.348 to 0.3. 7. Final answer: 0.348 has 3 significant figures as is.