WAEC 2025 · Paper 1 · Q3✱✱

Express $0.000834$ in standard form.

Worked solution (try it first)

Move the point to just after the first non-zero digit: 0.000834 becomes 8.34.
The point moved 4 places to the right, and the number is less than 1, so the power is $-4$ .
So $0.000834 = 8.34 \times 10^{-4}$ , option A.