CBSE Class 7 Mathematics/ Algebraic Expressions- Chapter 12
CBSE Class 7 Mathematics/Algebraic Expressions is about some model questions that you can expect for yearly examination. Here you can find out practice problems for class 7 Mathematics.
CBSE Class 7 Mathematics /Algebraic Expressions – Chapter 12
Important Questions for Yearly Examination
Answer the following:
- What are the coefficients of x in the following expressions?
a) 5x – 2y
b) 8 – x + y
c) 3y – 4xy
a) Coefficient of x is 5
b) Coefficient of x is -1
c) Coefficient of x is -4y
- Which of the following pairs of terms are of like terms and which are of unlike terms?
a) 3x, 8y
b) -3ba, 5ab
c) 5xy, 5x
a) Since the variables in the terms are different, 3x and 8y are unlike terms.
b) Since the terms have the same algebraic factors, -3ba and 5ab are like terms.
c) Since the variables in the terms are different, 5xy and 5x are unlike terms
- Get the algebraic expressions in the following cases using variables, constants and arithmetic operations:
a) Number 3 added to twice the product of numbers a and b
b) Product of numbers x and y subtracted from 12
c) One third of the sum of numbers x and y
a) 3 + 2ab
b) 12 – xy
c) 1/3 (x + y)
a) 7m – 5n, 3n – 4m + 2, 6m + 2n + 1
b) a + b – 3, b – a + 3, a – b + 3
a) 7m – 5n + 3n – 4m + 2 + 6m + 2n + 1 = (7m – 4m + 6m) + (-5n + 3n + 2n) + 2 + 1
= 9m +3
b) a + b – 3 + b – a + 3 + a – b + 3 = (a – a + a) + (b + b – b) + (-3 + 3 + 3)
= a + b + 3
- What should be subtracted from 3xy + 6x – 8y +9 to get 1?
To get 1, we need to subtract 3xy + 6x – 8y + 8 from 3xy + 6x – 8y + 9