13+4 - 17, 14+5 - 19, 15+6 - 21, 16+4 - 20, 17+5 - 22, 19+4 - 23, 6+4 - 10, 12+6 - 18, 11+4 - 15, 9+15 - 24, 8+4 - 12, 7+6 - 13, 7+7 - 14, 8+8 - 16, 6+5 - 11,

Single and double Digit Addition

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