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Math Help - Clarification on addition boundries

  1. #1
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    Clarification on addition boundries

    Good evening everyone.

    I was wondering if someone would be able to clarify something for me.

    I'm currently a teaching assistant trainee for a small school in Staffordshire, England.
    I can teach people all about biology, ICT and even German - Maths however is a different story

    This term I am helping a year 4 class with math problems. I've been working through my lesson plan fairly easy, but tonight I have reached a small snag.

    I've been working through guidelines such as counting back by 10,100, 1000. Recall Addidtion/Subtraction, etc etc.

    One of them is "Add/subtract a pair of two-digit numbers (not crossing
    10 or 100 boundary)"

    Can someone clarify what is meant by this please? Obviosuly I know how to add/subtract two digit numbers, but what is this 10/100 boundry? Does this just mean I can not go below 10 and above 100, or am I missing something?

    Any help would be greaty appreciated
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  2. #2
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    Quote Originally Posted by Razgriz View Post
    Good evening everyone.

    I was wondering if someone would be able to clarify something for me.

    I'm currently a teaching assistant trainee for a small school in Staffordshire, England.
    I can teach people all about biology, ICT and even German - Maths however is a different story

    This term I am helping a year 4 class with math problems. I've been working through my lesson plan fairly easy, but tonight I have reached a small snag.

    I've been working through guidelines such as counting back by 10,100, 1000. Recall Addidtion/Subtraction, etc etc.

    One of them is "Add/subtract a pair of two-digit numbers (not crossing
    10 or 100 boundary)"

    Can someone clarify what is meant by this please? Obviosuly I know how to add/subtract two digit numbers, but what is this 10/100 boundry? Does this just mean I can not go below 10 and above 100, or am I missing something?

    Any help would be greaty appreciated
    I'm guessing (German is much easier )

    Probably it is meant that the digits add up to maximal 9.

    An example: 32 + 55 is allowed - but: 35 + 47 is not allowed because 5 + 7 is greater than 10, that means you crossed the border.

    82 + 16 is allowed - but 82 + 26 is not allowed beacuse 80 + 20 is greater than 100 so you crossed the border again.

    ... and now I hope that I understood the question correctly.
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