Four - 2 + 2 =, Seven - 1 + 6 =, Fourteen - 11 + 3 =, Nine - 12 - 3 =, Twenty - 12 + 8 =, Ten - 20 - 10 =, Nine - 3 + 3 + 3 =, Twelve - 17 - 3 - 2 =, Eighteen - 16 + 3 - 1 =, Zero - 2 - 2 =,

Addition and subtraction under 20 - number words

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