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angieh
angieh asks:
Q:

adding doubles plus one

ok my 7 year old daughter comes home with her math sheet and it says to add doubles plus one her father and i have a disagreement on what needs to be done here is one example on her worksheet
9+8 =  should the answer make into a double which is
9+9 = 18 right ?

next question  add doubles to 20
example of her homework
5+5 =
and her answer is
5+5 = 10
please help she was crying that she does not want to be wrong on all the answers and it is only day 5 into school
and thanks
In Topics: Helping my child with math
> 60 days ago

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biffycart
biffycart writes:
The doubles plus one are the facts in which one addend is larger than the other by one. Examples 3+4=7, 6+7=13, 5+6=11, 3+2=5. Learning your doubles plus one should involve knowing the doubles and mentally adding the additional one.
> 60 days ago

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smith9456
smith9456 writes:
Doubles are adding the same number together, as with 5+5=10.
With doubles +1, the numbers must be in beside each other in counting order going up or down (ex: 4, 5, 6  and  9, 8, 7). I teach my first graders to say the SMALLEST number, double it, then add one. So, 9+8 would be 8+8=16, +1=17. You must know your doubles facts before this strategy is useful.
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face78
face78 writes:
5+5=10 or 5+4=9+1=10
> 60 days ago

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