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2-digit subtraction: tens
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| A | B |
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| 50 - 30 = 20 | 5 tens - 3 tens = 2 tens |
| 60 - 20 = 40 | 6 tens - 2 tens = 4 tens |
| 20 - 20 = 0 | 2 tens - 2 tens = 0 tens |
| 80 - 40 = 40 | 8 tens - 4 tens = 4 tens |
| 90 - 50 = 40 | 9 tens - 5 tens = 4 tens |
| 70 - 40 = 30 | 7 tens - 4 tens = 3 tens |
| 30 - 20 = 10 | 3 tens - 2 tens = 1 ten |
| 10 - 10 = 0 | 1 ten - 1 ten = 0 tens |
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