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### Grade 6 - Mathematics12.1 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?3xza Q 2: Which of the following is a variable?0a1,123,5469/15 Q 3: Which of the following is NOT a variable?3.5PRQ Q 4: Which of the following is a variable?N cm3 m6 ft1 in Q 5: Which of the following is a variable?P2.55 cm4/7 Q 6: Which of the following is NOT a variable?34.57 inchesnQAB Q 7: Which of the following is a variable?5x34 Q 8: Which of the following is a variable?1w50 Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!

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