One-step equations with addition and subtraction

The topic  is a topic under the 6th Grade Math Mission. This exercise has one-step equations involving addition and subtraction.

Types of Problems
There is one type of problem in this exercise:


 * 1) Solve the given equation: This problem provides an equation that requires one operation to solve. The student is expected to find the correct answer and type it in the space provided.Ose1.png

Strategies
Accuracy badges can be attained on this exercise with knowledge of the properties of equality. Speed badges are attainable because there is only one step necessary to arrive at the answers.


 * 1) When an addition problem is given, subtraction solves for the variable. Subtraction is non-commutative so care needs to be taken with the order of subtraction.
 * 2) When a subtraction problem is given, addition solves for the variable. Addition is commutative so order is irrelevant.
 * 3) It can be faster if one can recognize the number that needs to replaced in the equation to make it true.