Posted by **eduardo** on Tuesday, October 4, 2011 at 8:30pm.

please explain how to use doubles plus 1 and doubles minus 1

- math ASAP -
**bobpursley**, Tuesday, October 4, 2011 at 8:35pm
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

- math -
**zig**, Tuesday, October 11, 2011 at 5:18pm
0+1=1

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