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| Subtraction with Exchange | Units and Tens only | Phil Bagge | |||
| Subtraction with Exchange | Units, Tens & Hundreds | Phil Bagge | |||
| Subtraction with Exchange | Units Tens and Hundreds with zero in a column at the top | Phil Bagge | |||
| Subtraction with Exchange | Units, Tens, Hundreds & Thousands with two zeros in the top number | Phil Bagge | |||