Practice the questions given in the worksheet on constants and variables. The questions are related to constants and variables which are the two basic symbols in algebra.

**1. Separate, constants and variables from the following:**

5, 6z, -12x, 7/5, 3/4xz, mn, 2p, 0, 3x/4, 7/12k, -pt/2m, 1/2

**2. State whether the following statements are true or false:**

(i) 12 is a constant and z is a variable but 12z is variable.

(ii) 7 is constant and p is variable but together 7 + p is a variable.

(iii) 13 is constant and m is variable but together 13 - m is a constant.

(iv) 11 is constant and n is variable but together 11 n is a constant.

(v) 0 is a variable.

(vi) Combination of both a constant and a variable is also variable.

(vii) A quantity which takes a fix numerical value is called variable.

(viii) A quantity or symbol which has a no fixed value but it can represent any numerical values is called variable.

(ix) 15x, z/3, 7/m are some of the examples of constants.

(x) x, a + b, c – 2, a 13 are some of the examples of variables.

**3. Fill in the
blanks:**

(i) In -3x, _____ is constant and _____ is variable.

(ii) In 10ab, _____ is constant and _____ are variables.

(iii) In 15mn/k, _____ is constant and _____ are variables.

(iv) In 27a/8b, _____ are constants and _____ are variables.

**4.** 91y + 5, find the constants.

**5.** 32m + 9n, find the variables.

Answers for the worksheet on constants and variables are given below to check the exact answers of the above questions.

**Answers:**

**1. **5, 7/5, 0 and
1/2 are constants.

6z, -12x, 3/4xz, mn, 2p, 3x/4, 7/12k, -pt/2m are variables.

**2. **(i) True

(ii) True

(iii) False

(iv) False

(v) False

(vi) True

(vii) False

(viii) True

(ix) False

(x) True

**3. **(i) In -3x, **-3** is
constant and **x**
is variable.

(ii) In 10ab, **10** is constant and **a and b** are variables.

(iii) In 15mn/k, **15** is
constant and **m,
n and k** are variables.

(iv) In 27a/8b, **27 and 8** are constants and **a and b** are variables.

**4.** 91 and 5 are
the constants.

**5.** m and n are the variables.

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