1. (42)10 = ( ? )2Solution:`(42)_10 = (underline{" "})_2`| 2 | 42 | | |
| 2 | 21 | 0 | ↑ |
| 2 | 10 | 1 | ↑ |
| 2 | 5 | 0 | ↑ |
| 2 | 2 | 1 | ↑ |
| 2 | 1 | 0 | ↑ |
| 0 | 1 | ↑ |
`:. (42)_10 = (underline{101010})_2`
2. (89.625)10 = ( ? )2Solution:`(89.625)_10 = (underline{" "})_2`| 2 | 89 | | |
| 2 | 44 | 1 | ↑ |
| 2 | 22 | 0 | ↑ |
| 2 | 11 | 0 | ↑ |
| 2 | 5 | 1 | ↑ |
| 2 | 2 | 1 | ↑ |
| 2 | 1 | 0 | ↑ |
| 0 | 1 | ↑ |
| 0.625 | × | 2 | = | 1.250 | `=>` | 1 | ↓ |
| 0.250 | × | 2 | = | 0.500 | `=>` | 0 | ↓ |
| 0.500 | × | 2 | = | 1.0 | `=>` | 1 | ↓ |
`:. (89.625)_10 = (underline{1011001.101})_2`
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