Posted by eduardo on Tuesday, October 4, 2011 at 8:30pm.
This is a method for early learners to use to add.
when adding two consecutive numbers, double the lower number, add 1
2+3=4+1=5
7+8=14+1=15
or, double the higher number, and subtract one.
3+2=6-1=5
7+8=16-1=15
11+10=11-1=21
11+10=20+1=21
0+1=1
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