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  1. #1
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    Default Year 7 Maths Homework Question

    My DD is in year 7. She had to work out 128 divided by 16 (answer is 8).

    I couldn't work out how to easily do this with her using pen and paper, showing working (NO calculator). I ended up doing 1x16=16, 2x16=32, 3x16= 48 etc.

    There has to be an easier way (not using a calculator). Could someone please give me a step by step? Thanks.

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    It's called long division.

    I'm having a total mind blank right now for what the symbol is called that you use to set out, but there is definitely an easier method. I'm sure if you google long division, you will find a how to guide.

    I'm really not looking forward to helping with maths, because I always used to get in trouble for not showing my working out 😂

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    Argh! This is just the sort of cr@p that prompted me to drop out of maths after year 10!!!

    I *think* what they're trying to teach your daughter is long division.

    If you google "Long Division Calculator" you can actually type your equation into their calculator online to get the answer. That might give you some ideas.

    Good luck....
    Last edited by Blossom74; 27-02-2017 at 17:54.

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    My memory is rusty but I don't think long division would work for this sum.

    16 into 1 can't do, so look at the first two digits
    16 into 12, can't do so look at the first three digits
    16 into 128 which is the problem

    I think the only way it can be done is the method you employed OP.

    Here is a link explaining long division:
    https://www.mathsisfun.com/long_division2.html

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    Default Year 7 Maths Homework Question

    I *think* the teacher would have been getting your daughter to explore/apply strategies she can use to solve problems when you can't do short or long division easily.

    So a simple starting point here would be doubling (and keeping track by tallying etc) and then applying trial and error ie double 16 is 32, double 32 is 64, double 64 is 128.

    Unfortunately that kind of problem works best for kids that can 'see' the answer and solve it relatively easily (which makes the process kind of pointless!).

    Another strategy is guess, check and improve. I would start by prompting her to multiply 16 by 10, and ask if the quotient has to be higher or lower than 10. Then use that as a starting point.

    Does your daughter understand the relationship between division and multiplication? If so, and she is relatively strong with multiplication, then guess check and improve is a good strategy.

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    Probably not the 'right' way to do it but I first divided it by 2 and then divided it by 8.

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    yeah their homework gets harder all the time.

    I often have to look up what to do in order to help DD

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    Quote Originally Posted by ShannyAnny View Post
    Probably not the 'right' way to do it but I first divided it by 2 and then divided it by 8.
    I'm an upper primary teacher and this is the way I would suggest. The other answers, by multiplying etc are all fine too, but you have the right idea here for quickest way.

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    Thanks for your replies.

    I should have mentioned that I would ordinarily do long or short division (short division being my fav because why use all the extra room) but as Ssecret Squirrel pointed out - it can't be used in this instance.

    I'm glad there wasn't a set formula (so that we could have easily found the answer) and that there are a couple of ways we could have gotten around it.

    I had never thought of the divide by 2 then divide by 8 strategy. Thanks for that.

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