Solve for a missing variable in subtraction equations

Solve for a missing variable in subtraction equations quiz for students to review basic algebra skills. In this quiz for example there are exercises in the following form: 9 – y = 4, find the value of ‘y’. In this case the value of y = 5. Knowing this stems from some operations and procedures that have to be followed in solving algebra problems. In the given example, known variables are grouped together and in so doing the signs change. 4 crosses over and takes a negative sign while ‘y’ moves over and takes a positive sign. Hence 9 – 4 is 5 which is the value of ‘y’. If this is replaced in the initial equation, it will be balanced on both sides. This is pre-algebra which is studied in 3rd, 4th, 5th and 6th