Pre-algebra addition equations with variables

This game is made of equations that come with unknown value that the grade 5 child has to find out , for example X + 5 = 7 what is the value of X? This topic is also covered in other topics in grade 6 and grade 7 and therefore sharpening skills using this game will help the child when he or she reaches the classes ahead. This game is good for self testing either at home or in school.