Given that 0.00078 can be written as a × 10n,
where 1 < a < 10, then the value of n is:
-3.
3.
4.
-4.
The number 631927 expressed in standard form is:
6.31297 x 10⁻⁵.
6.3 x 10⁵.
63.1927 x 10⁴.
6.31927 x 10⁵.
The number 234.5 × 10³ written in standard form is:
2.345 × 10⁴.
2.345 × 10⁵.
2.345 × 10².
2.345 × 10¹.
The number 0.000345 in standard form is:
3.45 × 10⁻³.
3.45 × 10⁻⁴.
34.5 × 105.
3.45 × 10⁴.
The number 163.35 × 10⁻³ expressed in standard form is:
16335 × 10⁻².
1.6335 × 10¹.
16.335 × 10⁻².
1.6335 × 10⁻¹.
