Two more ways to join Granny Squares.
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Chain Seam– With right sides of Granny Squares facing up and lying next to each other, attach yarn to corner stitch of one Granny Square and sc in same stitch, *ch 3, sc in corresponding st of other Granny Square, ch 3, skip 1 st on 1st Granny Square, sc in next st; repeat from * across edge, creating an open, lacy seam.
Dc2tog – With right sides of Granny Squares facing up and lying next to each other, attach yarn in corner st, yo, insert hook in same st, *yo, pull through, yo, pull through 2 loops on hook, yo, insert hook in corresponding st on other Granny Square, yo, pull through, yo, pull through 2 loops on hook, yo, pull through 3 loops on hook, skip 1 st on the 1st Granny Square, yo, insert hook in next st; repeat from * across edge. You are making a half dc on one Granny Square, a half dc on the other Granny Square and uniting them when the 2nd dc is completed.
Video – Simple & Sensational™ – #4 Join Granny Squares with Chain Seam and Dc2tog