The document Worksheet Question - Algebraic Expressions Class 7 Notes | EduRev is a part of the Class 7 Course Mathematics (Maths) Class 7.

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**Q.1. Simplify : (a) 2x â€“ {5y â€“ (x â€“ 2y)} (b) 5a â€“ {3a â€“ (2 â€“ a) + 4}**

**Ans. **(a) 3x + 7y

(b) a + 2

**Q.2. Pallavi spends â‚¹x daily and saves â‚¹ y per day. What is her income after 3 weeks? **

**Ans. **â‚¹21 (x + y)

**Q.3. If P = â€“ 10, find the value of P2 â€“ 2P â€“ 100. **

**Ans. **20

**Q.4. If a + b = 6, then find the value of **

**Ans. 3**

**Q.5. From the sum of 3x â€“ y + 11 and â€“ y â€“ 11, subtance 3x â€“ y â€“ 11.**

**Ans. **â€“y + 11

**Q.6. Write down the numerical coefficient in each of the following terms.**

**(i) xy (ii) â€“3xy (iii) 2p ^{3} (iv) â€“5abc**

**Ans. **(i) 1

(ii) â€“3

(iii) 2

(iv) â€“5

**Q.7. Simplify the expression and find its value when a = 5 and b = â€“3. 2(a + ab) + 3 â€“ ab**

**Ans. **2a^{2} + ab + 3, 38

**Q.8. Add 4x ^{2}y, 8x^{2}y and â€“2x^{2}y.**

**Ans. **10x^{2}y

**Q.9. Solve and verify your answer.**

** = x + 6**

**Ans. **

R.H.S. =

= L.H.S. = R.H.S

**Q.10. What should be added to a ^{2} + ab + b^{2} to obtain 4ab + b^{2}?**

**Ans. **2ab â€“ b^{2}

**Q.11. The length of a rectangular field is 6m less than three times its breadth. Find the dimensions of the rectangle if its perimeter is 148 m.**

**Ans. **Length = 54 m, Breadth = 20 m

**Q.12. Collect like terms and simplify the expression : 12m ^{2} â€“ 9m + 5m â€“ 4m^{2} â€“ 7m + 10**

**Ans. **8 m^{2 }â€“ 11 m + 10

**Q.13. What should be subtancted from a ^{3 }â€“ 4a^{2} + 5a â€“ 6 to obtain a^{2} â€“ 2a + 1?**

**Ans. **a^{3 }â€“ 5a^{2 }+ 7a â€“ 7

**Q.14. In an isoceles triangle, the base angles are equal, the vertex angle is twice either the base angle. What are the degree measures of the angles of triangle?**

**Ans. **Each of base angle = 45Â° Vertex angle = 90Â° 45Â°, 45Â° & 90Â°

**Q.15. A bag contains 25 paise and so paise coins whose total values is â‚¹30. If the total number of 25 paise coins is four times that of 50 paise coins, find the number of each type of coins.**

**Ans. **50 Paise coins = 20

25 Paise coins = 80

211 videos|109 docs|45 tests

### Examples: Factors, Coefficients and Types of Expressions

- Video | 10:22 min
### Simplifying Algebraic Expressions

- Video | 10:22 min
### Addition of Algebraic Expressions

- Video | 07:07 min
### Examples: Addition and Subtraction Numericals

- Video | 08:06 min
### Finding the Value of an Expression

- Video | 05:09 min
### Using Algebraic Expressions for Formulas

- Video | 07:05 min

- How are Expressions Formed?
- Video | 07:53 min
- Test: Algebraic Expressions - 3
- Test | 20 ques | 20 min