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Oct 10, 2015 at 15:04 answer added Tamara Reynolds timeline score: 2
Oct 4, 2015 at 18:28 answer added mweiss timeline score: 4
Oct 2, 2015 at 20:45 comment added MathAdam She definitely doesn't understand place value yet. She's learned the mechanics of addition.
Oct 2, 2015 at 20:14 comment added Karl I don't think I'm understanding this. In my opinion the student is demonstrating a lack of understanding of place value. The fact they can add in columns is a red herring as a full understanding of place value is unecesary for the algorithm.
Oct 2, 2015 at 2:33 comment added Benjamin Dickman One more thought [for now]: Can she vertically compute $14 + 9$? If so: How would she write this ($14 + 9 = 23$) horizontally?
Oct 2, 2015 at 2:18 comment added Benjamin Dickman Have you listened to her count? For example: Try asking her to count up to 25. If she is chanting the correct number names: Can she write them down, too? Ask her if she can write down the number that you say. Then say, e.g., "12." Can she write it? If she can, tell her you are going to say two numbers for her to write down. Then say, e.g., "12 and 47." Can she write them both? What about "12 plus 47"? Can she write this down? Can she write it down horizontally first and vertically second?
Oct 2, 2015 at 1:33 answer added Amy B timeline score: 6
Oct 1, 2015 at 17:33 comment added Gerhard Paseman Start her by adding the words "tens" and "ones" near every appropriate digit. So her rendering can be read as one "tens" and two "tens" plus 4 "ones" and 7 "ones" equals (or gives) 4 "tens" and 1 "ones". Then ask what people might mean by 78? 7 "ones" and 8 "tens"? If she can handle the mechanics of carry, she might get the abstraction of left-to-right numerical representation. Your "evidently" sentence is one I question. Gerhard "Failure Backwards is Success Forwards?" Paseman, 2015.10.01
Oct 1, 2015 at 16:52 review First posts
Oct 1, 2015 at 17:03
Oct 1, 2015 at 16:48 history asked MathAdam CC BY-SA 3.0