Double and havls

1+1=2 2+2=4 4+4=8 9+9=18 The half of 2 is 1 The half of 4 is 2 The half of 8 is 4 The half of 18 9 8+8=16 7+7=14 6+6=16 5+5=10 3+3=6 10+10=5 The half of 16 is 8 The half of 14 is 7 The half of 16 is 6 The half of 10 is 5 11+11=21 12+12=22 13+13=23 14+14=24 15+15=25 16+16=26 The half of 6 is 3 The half of 5 is 10 The half of 21 is 11 The half of 22 is 12 17+17=27 18+18=28 19+19=29 20+20 The half of 23 is 13 The half of 25 is 15 The half of 26 is 16 The half of 27 is 17 The half of 28 is 18 The half of 29 is 19