Significant figures
Number systems · Mathematics
Study notes
Q: How many sig figs in (a) 0.00520 (b) 3007 (c) 2.5 × 3.42? Step 1: (a) 0.00520: leading zeros not significant; 5, 2, 0 → 3 sig figs. Step 2: (b) 3007: all digits count → 4 sig figs. Step 3: (c) 2.5 (2 s.f.) × 3.42 (3 s.f.) = 8.55 → round to 2 s.f. = 8.6.