math ASAP

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

  • math ASAP -

    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 -

    0+1=1

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