Fun little game – Add & Subtract with Springbird - math games for kids Review

My 6 year old son loved it so much we bought the master pack. I feel like the "what's missing" level is out if place. It gives equations like "5-?=4". This is confusing to a kindergartener just learning basic addition and subtraction.
Review by Mr. Tightywhitey on Add & Subtract with Springbird - math games for kids.