16.54 x 10−5 - 6.76 x 10−8 + 0.23 x 10−6 ⇒ 1.654 x 10−4 - 6.76 x 10−8 + 2.3 x 10−7 ⇒ 1.654 x 10−4 - 0.000676 x 10−4 + 0.0023 x 10−4 ⇒ (1.654 - 0.000676 + 0.0023) x 10−4 ∴ 1.655624 x 10−4 ≃ 1.66 x 10−4
