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### MEAP Preparation - Grade 7 Mathematics2.26 Variable

Algebra
A branch of mathematics in which symbols, usually letters of the alphabet are used to represent numbers.

A variable is a symbol that represents a number. It is denoted by letters such as x, a, b, v, y, or t. A variable can assume any of a set of values.

Example:
If a stands for the length of a square, then perimeter of the square is expressed as 4 � a; and the area of the square is expressed as a x a.

Example:
The temperature of a town is given by the chart below:
 Day Temperature t0 Tuesday 300 Wednesday 250 Thursday 310 Friday 310
It changes or varies but at one particular instant it has a fixed value. Hence it is represented by a variable t.

Directions: Identify the variable from the choices. Also write at least 10 examples of your own.
 Q 1: Which of the following is NOT a variable?xaz3 Q 2: Which of the following is NOT a variable?3.5RPQ Q 3: Which of the following is a variable?1 in6 ftN cm3 m Q 4: Which of the following is a variable?5 cm4/7P2.5 Q 5: Which of the following is NOT a variable?X102CA Q 6: Which of the following is a variable?534x Q 7: Which of the following is a variable?09/15a1,123,546 Q 8: Which of the following is a variable?1w05 Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!