Common Core State Standard
When counting objects, say the number names in the standard order, pairing each object with one and only one number name and each number name with one and only one object.
CCSS: K.CC.B.4.a, 1.NBT.B.3, 3.OA.D.9, 4.OA.B.4
Slide the math gate back and forth to allow the correct number balls to cross while preventing the wrong ones from crossing. Choose to practice one of four skills: counting, multiples, even/odd numbers or number comparison.