Rectangle

Crocheting a granny rectangle can be quite tricky... and there are loads of variations for it (my first formula inspired by rectangle granny square i saw in Blair Stokers grannysquare sampler and a different approach for granny rectangle by Sue Rivers and probably many more I don't even know about) ... the latest revelation in this matter looks like this!

And its formula as always starts from the space it needs to fill :)

• x - longest edge (I am counting the holes or typical joining points of the typical granny square)
• y - shortest edge
• z - edge length difference z=x-y 
• B - the chains needed for the beginning or middle

B=7+4z

btw, the rounds needed to make the rectangular granny square (R) can be caunted too ->
R=y

Schemes

First round or the middle of granny rectangle would look like this ->

The second round would look like this.
I draw just one for z=2, because I think it's pretty clear from there how the scheme should look like for other Z-ies ...

And If you have crocheted a granny square you will know what to do next ;)
If not - check out the scheme for ordinary granny square and/or ask questions - I will try to answer them as soon as possible.

Picture tutorial to make this more clear ;)

1st step Calculations
You estimate the size of the gap (or the size of the needed granny square rectangle).

x=5
y=3

And calculate the edge length difference (z), the chains needed (B) and the rounds needed (R) to form the appropriate granny rectangle.
z = 2
B = 7 + 4z = 7 + 8 = 15
R = y = 3

2nd step First round - Beginning
Crochet the chain with 15 stitches. Then in fifth chain from hook crochet one double crochet, then two more in next chains ... I actually think that scheme shows it better than I could ever say it with words...

3rd step Second round
Change the color if you like and crochet the next round. To form a corner you will need to crochet 3 double crochets 3 times .. on the long side of rectangle crochet 3 double crochets in each hole (in this case there is only one).

4th step Keep ON crocheting ;)
In this example 3rd row is the last one so I joined it in the gap and woala! It's done! :)

Hope you'll find this useful :)

Happy crafting! ;)