We decide to provide here a collections of past papers and solutions for those who wish to practice the math problems. Awards are given to the top scoring students per grade at the national level.If 𝑥𝑥 is replaced by 2, the new closed sentence, 2 + 3 = 5, is true because 5 = 5. From here, students conclude that solving an equation is the process of determining the number or numbers that, when substituted for the variable, result in a true sentence (6.EE.B.