numbers-11-20-activities-promoting-classroom-dynamics-group-form 37555
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10 + 10 = twenty 17 – 3 = fifteen 13 + 4 = seventeen 15 – 3 = twelve 10 - 1 = nine 13 + 5 = eighteen 20 - 4 = sixteen 18 - 7 = eleven 10 + 9 = nineteen 10 + 3 = thirteen 12 + 2 = fourteen 17 – 2 = fifteen