- Display the expression 4. Roll a number cube to determine values for the variables. Model how to substitute those values into the expression and evaluate the expression, using the order of operations. Review and discuss the algebraic vocabulary. Coefficient, expression, variable, base,.
- ); use b = 4, and c = 1 4) n (m + p) − 1; use m = 1, n = 2, and p = 3 Write each as an algebraic expression. 5) the difference of 27 and x 6) the quotient of 60 and a number 7) 9 more than a number 8) a number decreased by 3 is 38.
Before class, use Handout 7.1: Algebraic Expressions Scavenger Hunt Posters to make posters for the scavenger hunt. Distribute Handout 7.2: Algebraic Expressions Scavenger Hunt Recording Sheet. Show the posters to the students pointing out that each poster has a description of an algebraic expression and an algebraic expression. ID: 1066983 Language: English School subject: Math Grade/level: 7-12 Age: 12-18 Main content: Algebra Other contents: Add to my workbooks (25) Download file pdf Embed in. Evaluating Expressions in Single Variable Evaluate each algebraic expression by substituting the given value of the variable. These 6th grade pdf worksheets are split into three levels based on the number of operations involved and the values of the variables.
Grade 8 Maths Algebraic Expressions and Identities Multiple Choice Questions (MCQs)
1. What are the co-efficients of y in the expression yz2 + 5?
(a) 5
(b) z
(c) z2
(d) None of these
2. The constant term in the expression 1 + x2 + x is
(a) 1
(b) 2
(c) x
(d) x2
3. The expression x + y – xy is:
(a) Monomial
(b) Binomial
(c) Trinomial
(d) Quadrinomial
4. From the following expressions 3ab, a2, b2, a, 5ab, -2ab, 2a2 the three like terms are:
(a) 3ab, 5ab, -2ab
(b) a2, a, 2a2
(c) 3ab, a2, b2
(d) 2a2, a2, a
5. The value of expression 5n – 2, when n = -2 is:
(a) -12
(b) 8
(c) 1
(d) -8
6. If the length of each side of the equilateral triangle is l, then the perimeter of the equilateral triangle is:
(a) 3l
(b) 3 + 1
(c) 3 – l
(d)
7. Which of the following is trinomial:
(a) 2a + 6b – 1
(b) 1
(c) 5a – 7
(d) a + b + c – 3
8. The value of expression 5n2 + 5n – 2 for n = -2 is
(a) 13
(b) 3
(c) 8
(d) 12
9. The expression for the statement: “y multiplied by 10 and then 7 added to product”.
(a) 10 + y + 7
(b) 7y + 10
(c) 10y + 7
(d) 10y
10. The numerical co-efficient of y in the expression 2x + 3y + 7z is:
(a) 2
(b) 3
(c) 7
(d) 3y
11. ‘2’ is common factor of the expressions:
(a) 12a2 b, 15ab2
(b) 5xy, 10x
(c) 10x2, -18x3, 14x4
(d) 33y, -22z
12. The area of a rectangle is ‘xy’ where V is length and ly’ is breadth. If the length of rectangle is increased by 5 units and breadth is decreased by 3 units, the new area of rectangle will be:
(a) (x – y)(x + 3)
(b) xy + 15
(c) (x + 5)(y – 3)
(d) xy + 5 – 3
13. The product of a2, 2a2, 5a10 is
(a) 10 a14
(b) 7 a14
(c) 10 a22
(d) 10 a40
14. Which of the following expression is trinomial:
(a) xyz
(b) xy + z
(c) x + y + z
(d) x + yz
15. Value of expression a(a2 + a + 1) + 5 for ‘ a’ = 0 is:
(a) a + 5
(b) 1
(c) 6
(d) 5
16. Evalute (4x + y)2 by suitable identity:
(a) 4x2 + y2 + 8x
(b) 4x + y + 8xy
(c) 16x2 + y2 + 8xy
(d) 16x2 + y2 + 8
17. (a – b)2 is equal to:
(a) a2 + b2 – 2ab
(b) a2 – b2 + 2ab
(c) a2 – b2
(d) (a – b)(a + b)
18. If ab = 6 and a + b = 5 then the value of (a2 + b2) is:
(a) 11
(b) 12
(c) 13
(d) 16
19. If x – y = 7 and xy = 9, then the value of (x2 + y2) is:
(a) 64
(b) 67
(c) 63
(d) None of these
20. If = 4, then the value of is:
(a) 14
(b) 12
(c) 16
(d) None of these
Class 8 Maths Algebraic Expressions and Identities Fill In The Blanks
1. The number of terms in the product of (3x2 + 6xy + 5y2) and (3x + 4y – 13) is ……………….. .
2. In the product of (4a3 + 5a2 – 11a) and (-15 + 3a – 7a2), the co-efficient of a4 is …………………… .
3. The value of (3a – 4b + 2) × (5a + 6) for a = 1 and b = -2 is ……………… .
4. The value of is ………………. .
5. Find the product: (A + B).(A – B).(A2 + B2).(A4 + B4) = ………………….. .
Class 8 Maths Algebraic Expressions and Identities True(T) Or False(F)
1. If, a + = 7, then a2 + = 49
2. The product of a binomial and a trinomial will always have 5 terms.
3. (3x2 + 5y2) × (5x5 + 8y3) = 15x7 + 24x2y3 + 25x5y2 + 40y5
Class 8 Maths Algebraic Expressions and Identities Very Short Answer Type Questions
1. What are the co-efficients of y in the expression 4x – 3 y?
2. What is the statement for the expression 3mn + 5
3. What is the numerical co-efficient of y2 in the expression 2x2y – 15xy2 + 7y
4. What must be subtracted from 2a + b to get 2a – b.
5. What must be added to 3x + y to get 2x + 3y?
6. What should be value of ‘a’ if y2 + y – a equals to 3 for y = 1?
Class 8 Maths Algebraic Expressions and Identities Short Answer Type Questions
1. What must be added to 7z3 – 11z2 – 129 to get 5z2 + 7z – 92 ?
2. If (3x – 5y) = 10 and xy=5, then find the value of 9x2 + 25y2.
3. If x + y = 9 and xy= 14, find x2 – y2.
4. If 3x + 2y = 12 and xy = 6, find the value of 9x2 + 4y2.
Class 8 Maths Algebraic Expressions and Identities Long Answer Type Questions
1. Given (x2 + y2) = 74 and xy = 35, find the value of x + y and x – y.
2. If x + = 4, find the value of
3. Using suitable identities evaluate the following:
(i) (93)2
(ii) (12.5)2 – (7.5)2
(iii) 93 × 109
Worksheets for Class 8 Maths
Evaluating Algebraic Expressions Worksheet Grade 7 Pdf
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