640 mg ≈ 6.4 × 10^-7 t. To convert milligrams to metric tonnes, divide by 1,000,000,000: 640 ÷ 1,000,000,000 = 6.4 × 10^-7.
How to convert milligrams to metric tonnes
t = mg × 1 × 10^-9
- 1 mg = 1 × 10^-9 t (and 1 t = 1,000,000,000 mg).
- Multiply the amount by the factor: 640 × 1 × 10^-9 = 6.4 × 10^-7.
- Answer: 640 mg ≈ 6.4 × 10^-7 t (rounded to 6 significant figures).
Shortcut: dividing by 1,000,000,000 gives the same result as multiplying by 1 × 10^-9.
Milligrams to Metric Tonnes table
| Milligrams (mg) | Metric Tonnes (t) |
|---|---|
| 635 mg | 6.35 × 10^-7 t |
| 636 mg | 6.36 × 10^-7 t |
| 637 mg | 6.37 × 10^-7 t |
| 638 mg | 6.38 × 10^-7 t |
| 639 mg | 6.39 × 10^-7 t |
| 640 mg | 6.4 × 10^-7 t |
| 641 mg | 6.41 × 10^-7 t |
| 642 mg | 6.42 × 10^-7 t |
| 643 mg | 6.43 × 10^-7 t |
| 644 mg | 6.44 × 10^-7 t |
| 645 mg | 6.45 × 10^-7 t |
| mg | t |
|---|---|
| 1 mg | 1 × 10^-9 t |
| 5 mg | 5 × 10^-9 t |
| 10 mg | 1 × 10^-8 t |
| 50 mg | 5 × 10^-8 t |
| 100 mg | 1 × 10^-7 t |
| 1,000 mg | 0.000001 t |