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http://iamtotallyobsessedwithyarn.blogspot.com/2006/01/granny-square-pattern-with-pictures.html
Round 1:
ch 48
Dc in 4th ch from hook and next 2 chs, ch1 *sk 1 ch, dc in next 3chs, ch 1* repeat from * to * across (9 more times) ending with 1 dc in last ch. fasten off leaving a long tail to weave in
Round 2:
Attach new yarn in last ch-1 sp before the last dc. Ch 3, 2 dc, ch-1 in same sp, 3 dc, ch-1, 3 dc, ch-1 inside dc loop, working on other side of starting ch (3 dc, ch-1 in each sp across) until ch 4 loop (3dc, ch-1, 4 times in loop), (3dc, ch-1 in each sp across) joining with sl st in first dc.
Round 3: Attach yarn in first ch-1 sp of row 2 (ch 3, 2 dc, ch-1, 3dc ch-1 in same sp for corner, 3 dc, ch-1 in next sp, (3 dc, ch-1, 3 dc, ch-1 in next sp for corner) 3 dc, ch-1 in each sp across joining in ch 3.
Round 4: continue in pattern until size desired.
For more than one row of same color after joining sl st to the first ch sp and work in pattern.
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And now...the pictures :)
This is what it looks like once you complete the starting chain, and the First Round


[619x478]

And once you've attached the yarn for Round 2 (I like to crochet over the loose tails at the start of the afghan, helps me later when I go back to weave the tails in once I'm done)
This is how the increases should look
Join with a slip stitch (if not changing the yarn color, you can sl st in the next dc, and sl st in the ch 1 sp and then chain 3 and dc twice in the ch 1 space, ch 1, dc 3 times in the same space)
(note: I changed colors so you can see how each stitch looks from one round to the next)
And this is how it should look once you're finished with the Third Round. Once you get to this point, you should be able to follow the established pattern until the afghan is the size you want it to be.
You can pretty much make this afghan as big as you want. I've made crib sized afghans, queen sized afghans, and even a table doily with this pattern. I've always found it to be one of the easiest patterns for me to do, and one of the fastest.
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