(1.67 x 10⁻²⁴) / (2.66 x 10⁻²³) = (1.67 x 10⁻²⁴) / ((2.66 x 10¹) x 10⁻²⁴)
The factors of 10⁻²⁴ cancel, and 2.66 x 10 = 26.6, leaving us with
(1.67 x 10⁻²⁴) / (2.66 x 10⁻²³) = 1.67 / 26.6 ≈ 0.0628
Convert this to scientific notation:
0.0628 = 6.28 x 10⁻²