4th grade Variable expressions Math Quiz, Variable expressions are expressions that are built up from integer constants, operations and variables. They are essential as they provide solution to most critical mathematical and engineering problems. Solving variable expressions is an integral part of Algebra which is a fundamental part of mathematics. Algebra has its root deep into the mathematical structure of various things including geometry all around us. Without understanding algebra, it is impossible to excel at mathematics. To help kids who study in grade 4, this test is specifically designed so that they get the basic idea of variable expressions and test their existing knowledge of solving variable expressions.