10+2= - 12, 10+5= - 15, 10+1= - 11, 10+3= - 13, 10+4= - 14, 10+6= - 16, 10+7= - 17, 10+8= - 18, 10+9= - 19, 10+10= - 20,

Ten and some more = Teen number

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