Variables and Rules

Variables and Rules

What students learn

Students learn that a variable is a symbol for a number that can change or stay unknown. Begin with Variables: Stand for Unknown Numbers to see why letters matter in math.

Why it matters

Variables let students write a rule without repeating every example. Variables: Write a Rule with Letters shows how a letter can stand for the input or another unknown part of the pattern.

Learn the idea

A variable is not a mystery shape or a label. It is a number holder. Variables: Check Values in an Equation helps students test whether a value really fits the rule.

Try it

Ask the student to write a rule for each situation: start with a number, add 4, then double it; start with a number, multiply by 3. Have them use a letter to name the input.

Parent guide

Use simple phrases such as "the letter stands for the number" and "check whether the value fits." If the child treats the variable like a word label, return to a concrete example and test a few values.