142 mm2 ≈ 1.42 × 10^-10 km2. To convert square millimeters to square kilometers, divide by 1,000,000,000,000: 142 ÷ 1,000,000,000,000 = 1.42 × 10^-10.
How to convert square millimeters to square kilometers
km2 = mm2 × 0
- 1 mm2 = 0 km2 (and 1 km2 = 1,000,000,000,000 mm2).
- Multiply the amount by the factor: 142 × 0 = 1.42 × 10^-10.
- Answer: 142 mm2 ≈ 1.42 × 10^-10 km2 (rounded to 6 significant figures).
Shortcut: dividing by 1,000,000,000,000 gives the same result as multiplying by 0.
Square Millimeters to Square Kilometers table
| Square Millimeters (mm2) | Square Kilometers (km2) |
|---|---|
| 137 mm2 | 1.37 × 10^-10 km2 |
| 138 mm2 | 1.38 × 10^-10 km2 |
| 139 mm2 | 1.39 × 10^-10 km2 |
| 140 mm2 | 1.4 × 10^-10 km2 |
| 141 mm2 | 1.41 × 10^-10 km2 |
| 142 mm2 | 1.42 × 10^-10 km2 |
| 143 mm2 | 1.43 × 10^-10 km2 |
| 144 mm2 | 1.44 × 10^-10 km2 |
| 145 mm2 | 1.45 × 10^-10 km2 |
| 146 mm2 | 1.46 × 10^-10 km2 |
| 147 mm2 | 1.47 × 10^-10 km2 |
| mm2 | km2 |
|---|---|
| 1 mm2 | 0 km2 |
| 5 mm2 | 5 × 10^-12 km2 |
| 10 mm2 | 1 × 10^-11 km2 |
| 50 mm2 | 5 × 10^-11 km2 |
| 100 mm2 | 1 × 10^-10 km2 |
| 1,000 mm2 | 1 × 10^-9 km2 |