Addition Shortcut

Adding By Group Look for combinations that reach to 10-level (10, 20, 30, 40, etc.). For example: 3 + 4 + 7 + 6 + 3 + 7 → 3 + 7 + 4 + 6 + 3 + 7 → 10 + 10 +10 = 30; 22 + 41 + 5 + 8 + […]

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