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Unsure of the differences between UK and US terms? Need a refresher on how to do your stitches? In my ‘How to crochet: A handy reference guide’ EBook I help you with all of these terms and you can always have them to hand! You will also get exclusive access to free video instructions. You can find my EBook here: http://bit.ly/BellaCocoEbook
It important to know that there is a difference in UK terms. The techniques are the same, there is just different terminology. Being aware of this from the beginning will help you with learning to crochet, this conversion chart will help you:
-How many chains shall I do for a *single/double/etc' blanket?
Again, this can vary. I would suggest that you do your chain and lay it down agains the bed you are wanting it for. It should be the same width. You should then ad a few more to make it a little wider.
Unfortunately, I will not be able to answer individuals questions about how much yarn you would used do to multiple factors affecting it. Such as, your tension, the size of hook and the yarn being used.