Q:

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 =
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
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> 60 days ago

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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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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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writes:
5+5=10 or 5+4=9+1=10
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, Teacher writes:
Non-Common Core: 1 + 0 = 1
Common Core: 1 + 0 = 1 + 1 = 2

Non-Common Core: 2 + 1 = 3
Common Core: 2 + 1 = 3 + 1 = 4

Non-Common Core: 3 + 1 = 4
Common Core: 3 + 1 = 4 + 1 = 5

This will prepare your child for knowing the language of the computer in both binary and hexidecimal.

Binary:

128|64|32|16 - 8|4|2|1

0000-0000 = 0
0000-0001 = 1
0000-0010 = 2
0000-0011 = 3
0000-0100 = 4
0000-0101 = 5
0000-0110 = 6
0000-0111 = 7
0000-1000 = 8
0000-1001 = 9
0000-1010 = 10

Hexidecimal:

1    2   3   4   5  6   7  8   9  A   B   C   D  E   F 10
11 12 13 14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20
21 22 23 24 25 26 27 28 29 2A 2B 2C 2D 2E 2F 30
31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40
41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50

Good luck!
> 60 days ago

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writes:
Doubles plus one:   9+8= 8+8+1

Doubles minus one:  9+8=9+9-1

Doubles to 20:
1+1=2
2+2=4
3+3=6
and so on until you reach: 10+10=20

I know I'm late but I hope it helps you and your husband.
> 60 days ago

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writes:
Well, I have the same question as the person above and see that that there was never an answer given. My grandchild has that same type of homework which is a little confusing.
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writes:
I think they are looking for 8+8=16 plus one equals 17
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Sorry very late, but I am a teacher and we teach this strategy to our first grade students.  The students first get to know their doubles 1+1, 2+2, 3+3.. and so on.  Once they know these doubles student should be able to add quickly doubles plus one.  Example, if you know 3+3=6 then you should know that 3+4= 7.  This problem could really been seen as 3+3+1.  I hope this helps.
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difficult problem and I think the way to get through it this problem in the future. http://www.friv10000games.net/ and http://www.kizi3gamess.com/
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writes:
Doubles plus one :
6 + 7= 13
4 +5= 9
5 + 6= 11

Doubles minus 1=
7+ 6 = 13
8 + 7 = 15
5 + 4 = 9
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writes:
To do doubles plus one.
Step 1:   First check to see that the numbers are consecutive on the number line.  8 and 9 are, so you can do this rule.
Step 2:  Select  which number is the least.  8 is least, so you can double that number to add one to.  8 + 8 + 1 = 17
Step 3:
> 60 days ago

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> 60 days ago

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Maths can be a scary subject for our kids and sometimes our anxiety and lack of 'love' for the subject can rub off on our kids, which increases their fear, mental and psychological block on the subject. Therefore, please calm down, go online or send an e-mail to his/her class teacher for clarification before approaching your child with answers, corrections or clarification.

Doubles is such a fun topic which the kids in my class have been having fun with. However, questions or worksheets are given to the children to assess their comprehension or reasoning skills at times.

The first part of the question is tricky but sums up into creating a double as you have rightly surmised.

The next question is for her to add doubles to 20. let her start from 1, for example 1+1= 2, 2+2=4, all the way up to 20. Adding doubles in order up to 20 is easy for children who can count in twos already.

Pretta.
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, Parent writes:
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 =
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
Thanks for share ...
> 60 days ago

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writes:
Doubles to 20:
1+1=2
2+2=4
3+3=6
and so on until you reach: 10+10=20
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, Parent writes:
next question  add doubles to 20
example of her homework
5+5 =
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
> 60 days ago

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writes:
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