c/c_Mathematics_Grade 3_one-step addition and subtraction equations with an unknown number

Subject
Mathematics
Grade
Grade 3
Concept/Content
one-step addition and subtraction equations with an unknown number
Elaboration
  • start unknown (e.g., n + 15 = 20 or □ + 15 + 20)
  • change unknown ( e.g., 12 + n = 20 or 12 + □ = 20)
  • result unknown (e.g., 6 + 13 = n or 6 + 13 = □;)
  • investigating even and odd numbers
keywords
equations