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Thread: I have a question for all you math wiz's

  1. #1

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    I am making a disappearing 9 patch... Now if I start out with a 5 inch block - after I sew and cut apart and sew together again. What is my finished size gonna be? 13inches?

    I went to my fav quilt shop to buy border material and I came out with fabric for another quilt and no fabric for my border that I was surposed to buy... I am so in trouble. Oh well I was not in that big of a hurry to finish anyway.... I have all winter to finish that quilt... lol

    This fabric I bought is gorgeous... It is a two color disappearing 9 patch but it is batiks.... I was gonna give away as a Christmas gift but there is no way this will be leaving my house.

  2. #2
    Senior Member Shelley's Avatar
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    Are you starting out with a cut 5" square or a 5-1/2" square to finish (normally) to 5"?

  3. #3
    Super Member Shemjo's Avatar
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    With your 3 pieces across for your 9 patch, you should come out close to a 13 inch block. I like to leave them alittle big, so I can square them up all to the size of the smallest one. Your should be okay. I am just roughing this in my head, so I could be wrong, but it is what I got. :?

  4. #4
    Super Member LucyInTheSky's Avatar
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    I like the 93+ views and 2 replies to this message :-D

    Mathwise, yes, around 13

  5. #5
    Power Poster dunster's Avatar
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    I assume you're starting out with a 15" block finished (unfinished it measures 15.5 inches). When you cut it in half and sew it back together you will lose only .5 inch in each direction, because you're making a 1/4 inch seam. Your resulting block is 14.5 inches (finished) or 15 inches unfinished.


  6. #6
    Moderator sharon b's Avatar
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    Hey I don't know the answer.. just wanted to see what the answer would be :oops:

  7. #7
    Senior Member Shelley's Avatar
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    Here's how anal I am: When I made some D9P's, I added an extra 1/2" to the center blocks (that form a cross before cutting) to make up for those extra cuts. That way I would end up with EXACTLY the size block that I wanted. Sick....I know!!!

  8. #8
    Power Poster amma's Avatar
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    If you start out with 9- 5" blocks and sew them together you will have a 14" square block.

    When you cut that block into quarters they will each be 7" square

    Sew 4 quarters together into a 13 1/2" square block. 8)

  9. #9
    Junior Member ledraj's Avatar
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    I would make a sample block, then you will know exactly what size you get.
    My math says 13 1/2 in. if you start with a 5 " block. I wouldn't want to sq. up a D9 too much because of the pattern of the block.

  10. #10
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    This retired math teacher agrees with Amma--but those are the numbers in a perfect world. Check out a couple of your completed blocks and square them up to match one another.

  11. #11
    Power Poster dunster's Avatar
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    We're all saying the same thing; the difference is in whether you're referring to finished or unfinished sizes.

    The thing to remember is that your block size is reduced by .5 inch (height and width) when you turn a 9-patch into a D9P. This is true whether you're referring to finished sizes or unfinished sizes, as long as you're consistent.

    If you start with 5" finished patches, that's a 15" finished 9-patch, and you get a 14.5" finished D9P.

    If you start with 5" unfinished patches, that's a 14" unfinished 9-patch and a 13.5" unfinished D9P.


  12. #12
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    Amma is right.. I just made one of 5" blocks.. not 5.5 but 5" square.

  13. #13
    Super Member wvdek's Avatar
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    lmarsoff. Why, even the math teacher says make a sample block. And that folks is why so many lookers and hardly any takers - your dealing with MATH the most dreaded subject in American schools. AAArghhh! :lol: :lol: :lol: :roll:

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