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Doubles Plus One Addition Facts

Remember the trick if you need it. Double the smaller number and add one more.

AB
1+2=3
2+3=5
3+4=7
4+5=9
5+6=11
6+7=13
7+8=15
8+9=17
2+1=3
3+2=5
5+4=9
6+5=11
7+6=13
8+7=15
9+8=17
4+3=7