Video Tutorial

To make a blanket  90x90cm

Row 1: Chain 140
Row 2: Start with chain 3. Skip 1 stitch, 2 double crochet together, repeat to the end of the row *skip 1 stitch, 2 double crochet together*, finish the row with skip 1 stitch, 1 double crochet
Rows 3 to the end of the blanket (90cm): Start with chain 3, 2 double crochet together between the 2 double crochet together of the previous row, repeat the same to the end, 2 double crochet together between the 2 double crochet together of the previous row. Finish the row with 1 double crochet on the 3rd chain of the previous row.
 

Finish the blanket making an edge of single crochet around de sides