In a 100g (5.5 oz) skein there are about 290 m (317 yds) so plan to knit:
550g = 6 skeins for men size M
400g = 4 skeins for women size M
300g = 3 skeins for children 10 yrs
Machine wash 30°C (86°F) with detergent for wool without fabric softener.