Grade 2 - Arithmetic: Understanding and writing numbers
Standard 2.ARTU.1.1.6 - Simplify both sides of the equation and find the missing number that makes the equation true.
Included Skills: Subtraction
Identifies equivalent expressions (e.g. 52 = 40 + 12, 25 + 27 = 40 + 12, 52 = 104 ÷ 2)