Wich is a doubles plus one fact?

Mathematics
Tutor: None Selected Time limit: 1 Day

jho w many

May 19th, 2015

 doubles plus one examples:

3+2=5

3+4=7, 4+5=9, 5+6=11

best me please thanks

May 19th, 2015

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May 19th, 2015
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May 19th, 2015
Dec 4th, 2016
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