Subtracting with Regrouping

Level 1 · 2-digit − 2-digit
Level 2 · 2-digit − 1-digit
Level 3 · 3-digit − 2-digit
Level 4 · 3-digit − 3-digit
Level 5 · 3-digit, regroup twice
Level 6 · Across a zero
Level 7 · 4-digit − 3-digit
Level 8 · 4-digit − 4-digit
Level 9 · 4-digit, regroup 3 times
Level 10 · Across zeros

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