Make a slip knot on the right needle.
Place the thumb and index finger of your left hand between the yarn ends with the long yarn end over your thumb, and the strand from the yarn ball over your index finger. Close your other fingers over the strands to hold them against your palm. Spread your thumb and index fingers apart and draw the yarn into a V.
Place the needle in front of the strand around your thumb and bring it underneath this strand. Carry the needle over and under the strand on your index finger.
Draw the strand through the loop on your thumb. Drop the loop from your thumb and draw up the strand to form a stitch on the knitting needle.
Repeat until you have cast on the number of stitches indicated in the pattern.