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    Joined: Aug 2010
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    Quote
    For a problem like 96x8 they probably don't expect you to use the long multiplication algorithm... that certainly isn't how *I* would solve it.

    Now lets see.... 96*8
    Well if the kid already has an ok grasp of place value they probably know 100*8=800. So 96*8 is 4 less 8s. So 8x4=32, thats either memorized of easily figured out. So 800-32, well thats subtraction. If multidigit subtraction has been covered you're all set.

    It's very interesting to see this, too. I would much rather just do the multidigit multiplication. I wonder what DD would choose. She's faster at mental math than I am, but also very fast and competent at standard algorithms of all sorts.

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    Originally Posted by ultramarina
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    DD4.5 still has a hard time doing 3+4 but takes under a second to do 343+434.

    Whoa. I don't get this at all. Brains are weird.

    Let me clarify. When asked 3+4, she will try to count up from 3 to get to 7, which takes some time. But when doing the same addition but in a multidigit number, she just seems able to pull the sum out of her head. Similarly, she takes much longer to do 4 times 7 for example than 4 times 13 bcos she does 40+12 in her head. So yes it is a little weird but it seems perfectly normal when you are watching her solve it.:)

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