ProudGrandma Posted November 17, 2011 Share Posted November 17, 2011 my daughter is on lesson 17 of the Delta. Can someone explain to me why it is important for her to learn the inverted multiplication? For example: 0009 x234 instead of just 234 x 9 does that make sense? She has already learned problems like this: 123 x234 Quote Link to comment Share on other sites More sharing options...
morosophe Posted November 17, 2011 Share Posted November 17, 2011 Maybe so that she'll really know that the commutative property of multiplication is true, and then she'll never have to do it again? (I don't know, we're just about to start Gamma, so we're not there yet...) ...Or, so that when she divides 4,446 by 234, the part where she has to multiply 9 by 234 won't confuse her? Quote Link to comment Share on other sites More sharing options...
prairiewindmomma Posted November 17, 2011 Share Posted November 17, 2011 We chose to skip it. It was way too confusing for ds. Quote Link to comment Share on other sites More sharing options...
ProudGrandma Posted November 17, 2011 Author Share Posted November 17, 2011 good, becasue that is what I do too...glad I am not alone... Quote Link to comment Share on other sites More sharing options...
acurtis75 Posted November 17, 2011 Share Posted November 17, 2011 We watched the video and dd worked a problem or two like that but I think it was mostly to help children who were having trouble with the concept of place value. DD understands place value just find and didn't like the upside down multiplication so I didn't force it. When he teaches things on the DVD more than one way I generally have dd do a few problems each way and then pick which way she prefers to work the rest of the problems. Quote Link to comment Share on other sites More sharing options...
ProudGrandma Posted November 17, 2011 Author Share Posted November 17, 2011 good plan...I like that. Quote Link to comment Share on other sites More sharing options...
MyLittleBears Posted November 17, 2011 Share Posted November 17, 2011 We chose to skip it. It was way too confusing for ds. We did the same. Quote Link to comment Share on other sites More sharing options...
~Tara~ Posted November 17, 2011 Share Posted November 17, 2011 we skipped it too even my math minded (now 12 yr old in pre-algebra) was confused he 'got' what it was doing, but hated doing it we skipped it and will skip again when my next one approaches it...I am positive he will have melt down when he gets to that lesson Quote Link to comment Share on other sites More sharing options...
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