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jkcox jkcox is offline
 
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Doubles plus one/Doubles minus one
Old 10-25-2010, 11:24 AM
 
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My students have had trouble with the concept of doubles plus one/doubles minus one. Does anyone have any ideas or things to supplement to help them understand it better? Thanks in advance for any ideas.


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doubles
Old 10-25-2010, 12:40 PM
 
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are you using Envisions? Just asking because that's the lesson we are about to approach. Seems to me that most kids don't memorize the doubles facts in one teaching, so using doubles plus one as a tool isn't very handy--yet. You have to have internalized the doubles facts to be able to utilize the doubles plus one idea. However, my team did agree that knowing the difference between a doubles fact and a doubles plus one fact is important, and so we are starting with and supplementing with pictures of sets an actual sets of doubles and doubles plus one to show the idea.
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Old 10-25-2010, 01:12 PM
 
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Charts are always helpful. Maybe up up a chart of Doubles facts, Doubles plus one, and doubles minus one. With having these three charts next to one of another it may help students kind of register the common patterns with them. I hope this helps!!
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linking cubes
Old 10-25-2010, 01:31 PM
 
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When I teach doubles plus one the children make two towers from the same color linking cubes. (4 + 4 = 8) Then they add a different colored cube to one of the towers (4 + 5 = 9). This is only after they have worked extensively with the doubles. After they make the 4 + 5 = 9 then they do the "turn around" fact and write 5 + 4 = 9. We do these over and over and over... to help the children internalize them. Hope this helps.
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Using Ten Frames
Old 10-25-2010, 01:53 PM
 
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If you use a double 10-frame mat, it might help. I think sometimes the kids just memorize the doubles facts without really knowing what it means. That is why they have so much trouble with doubles +/- one.


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doubles plus one doubles minus one oh my
Old 10-25-2010, 02:50 PM
 
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we just spent 2 days on this concept.
some of the kids got it and most did not.
i want to share with them the different strategies to help them with their addition.
this is not one of my favorite to be sure-
i agree with previous post that they need a good handle on doubles facts first

the ideas shared here are great-thanks for sharing.
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Old 10-25-2010, 03:08 PM
 
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I also agree with PT learning the doubles first is essential.

we use the doubles rap to help

it goes like this....

It 's the doubles baby lets go, lets go, Its the doubles baby and we start with zero.

0+0=0 oh
1+1=2 oooh
2+2=4 more
6 kicks
8 thats great
10 again
12 thats swell
14 lets lean
16 really keen
18 jelly bean

our kids really like it
20 thats plenty
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doubles plus one
Old 10-25-2010, 03:27 PM
 
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We have just been learning about doubles and plus one. I tell my students it is a doubles plus or minus one when the numbers are next door neighbors on the number line. We drew a number line and then circled the neighbors. I do think it helped many see the concept of doubles plus one.
We also discussed how doubles will always be an even numbered sum.
They understand well what a double looks like but many have not memorized the facts at this point.
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Idea
Old 10-25-2010, 07:52 PM
 
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The ten frame is a great idea. Having the students construct the doubles and then add one or remove one can help them.

You can also make doubles cards using those colored stick on circles on 4 x6 cards. line up the circles so they are matched in pairs to really look like doubles. After the students have instant recognition of the groups to 10, you can have them move in a smaller extra card with one dot on it to do doubles + one and then have them use the blank side of the +1 card to cover a circle to see minus one. The visual and motor seem to help the concepts to stick.
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