Chapter 2 | Operations On Rational Numbers | Class-7 DAV Secondary Mathematics

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Chapter 2 | Operations on Rational Numbers | Class-7 DAV Secondary Mathematics

Operations on Rational Numbers || Unit 2 Worksheet 1

1. Add the following:

2. Find the values of:

3. Verify x+y = y+x for following values of x and y.

4. Verify x+(y+z) = (x+y)+z for the following values of x, y and z.

5. Simplify

6. For x = 1/5 and y = 3/7, verify that -(x+y) = (-x) + (-y).

7. Write True of False for the following statements.

(i) -2/-3 is the additive inverse of 2/3

Ans. False

(ii) 2/3 + 4/5 is a rational number.

Ans. True

(iii) -5/3 + 5/-3 is equal to zero.

Ans. False

(iv) 1 is the identity element of addition.

Ans. False

(v) -9/7 + 0 = 0.

Ans. False

(vi) Additive inverse of -3/5 is 3/5.

Ans. True

(vii) Negative of a negative rational number is negative.

Ans. False

• Chapter 1 Rational Numbers | Class-7 DAV Secondary Mathematics
• Chapter 2 Operations on Rational Numbers | Class-7 DAV Secondary Mathematics
• Chapter 3 Rational Numbers as Decimals | Class-7 DAV Secondary Mathematics
• Chapter 4 Exponents and Powers | Class-7 DAV Secondary Mathematics
• Chapter 5 Application of Percentage | Class-7 DAV Secondary Mathematics
• Chapter 6 Algebraic Expressions | Class-7 DAV Secondary Mathematics
• Chapter 7 Linear Equations in One Variable | Class-7 DAV Secondary Mathematics
• Chapter 8 Triangle and Its Properties | Class-7 DAV Secondary Mathematics
• Chapter 9 Congruent Triangles | Class-7 DAV Secondary Mathematics
• Chapter 10 Construction of Triangles | Class-7 DAV Secondary Mathematics
• Chapter 11 Perimeter and Area | Class-7 DAV Secondary Mathematics
• Chapter 12 Data Handling | Class-7 DAV Secondary Mathematics
• Chapter 13 Symmetry | Class-7 DAV Secondary Mathematics
• Chapter 14 Visualising Solids | Class-7 DAV Secondary Mathematics