680 cm2 ≈ 6.8 × 10^-8 km2. To convert square centimeters to square kilometers, divide by 10,000,000,000: 680 ÷ 10,000,000,000 = 6.8 × 10^-8.
How to convert square centimeters to square kilometers
km2 = cm2 × 1 × 10^-10
- 1 cm2 = 1 × 10^-10 km2 (and 1 km2 = 10,000,000,000 cm2).
- Multiply the amount by the factor: 680 × 1 × 10^-10 = 6.8 × 10^-8.
- Answer: 680 cm2 ≈ 6.8 × 10^-8 km2 (rounded to 6 significant figures).
Shortcut: dividing by 10,000,000,000 gives the same result as multiplying by 1 × 10^-10.
Square Centimeters to Square Kilometers table
| Square Centimeters (cm2) | Square Kilometers (km2) |
|---|---|
| 675 cm2 | 6.75 × 10^-8 km2 |
| 676 cm2 | 6.76 × 10^-8 km2 |
| 677 cm2 | 6.77 × 10^-8 km2 |
| 678 cm2 | 6.78 × 10^-8 km2 |
| 679 cm2 | 6.79 × 10^-8 km2 |
| 680 cm2 | 6.8 × 10^-8 km2 |
| 681 cm2 | 6.81 × 10^-8 km2 |
| 682 cm2 | 6.82 × 10^-8 km2 |
| 683 cm2 | 6.83 × 10^-8 km2 |
| 684 cm2 | 6.84 × 10^-8 km2 |
| 685 cm2 | 6.85 × 10^-8 km2 |
| cm2 | km2 |
|---|---|
| 1 cm2 | 1 × 10^-10 km2 |
| 5 cm2 | 5 × 10^-10 km2 |
| 10 cm2 | 1 × 10^-9 km2 |
| 50 cm2 | 5 × 10^-9 km2 |
| 100 cm2 | 1 × 10^-8 km2 |
| 1,000 cm2 | 1 × 10^-7 km2 |