alleryNumber of significant figures in 1.20 × 10⁻³ kg:
A3 (the leading non-zero, 0, 0 — three digits in mantissa)
B1
CWait — actually 1.20 has 3 sig figs (1, 2, 0)
D2
Answer & Solution
Correct answer: A. 3 (the leading non-zero, 0, 0 — three digits in mantissa)
1.20 × 10⁻³: mantissa 1.20 has 3 sig figs (the trailing 0 IS significant).
Exponent doesn't add sig figs.
**So total 3.**
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