Numbers up to 20 37 + = 12 1 ten and 2 ones make Twelve + = 13 1 ten and 3 ones make Thirteen + = 14 1 ten and 4 ones make Fourteen + = 15 1 ten and 5 ones make Fifteen + = 16 1 ten and 6 ones make Sixteen + = 17 1 ten and 7 ones make Seventeen