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Solve for Variable Worksheet

Solve for Variable Worksheet
  • Page 1
 1.  
Find the value of n if 280 × n = 280.
a.
10
b.
1
c.
2
d.
20


Solution:

280 × n = 280.
[Original algebraic expression.]

As the product of any number and 1 is the number itself, 280 × 1 = 280.

So, n = 1.


Correct answer : (2)
 2.  
Find the value of n if 200 × n = 0.
a.
10
b.
1
c.
20


Solution:

200 × n = 0.
[Original algebraic expression.]

As the product of any number and 0 is 0, 200 × 0 = 0.

So, n = 0.


Correct answer : (1)
 3.  
Find the value of n, if 76 + n = 143.
a.
54
b.
67
c.
90
d.
80


Solution:

76 + n = 143
[Original algebraic expression.]

n = 143 - 76
[Subtract 76 from both sides.]

n = 67

So, the value of the missing number is 67.


Correct answer : (2)
 4.  
Find the value of n if 68 + n = 286.
a.
218
b.
208
c.
354
d.
34 143


Solution:

68 + n = 286
[Original algebraic expression.]

n = 286 - 68
[Subtract 68 from both sides.]

n = 218

So, the value of the missing number is 218.


Correct answer : (1)
 5.  
Find the value of n, if 154 + n = 260.
a.
106
b.
89
c.
145
d.
160


Solution:

154 + n = 260
[Original algebraic expression.]

n = 260 - 154
[Subtract 154 from both sides.]

n = 106

So, the value of the missing number is 106.


Correct answer : (1)
 6.  
Find the value of the missing number n.
5 3 + n = 10 3
a.
5 11
b.
1
c.
5 7
d.
5 3


Solution:

5 / 3 + n = 10 / 3
[Original algebraic expression.]

n = 10 / 3 - 5 / 3
[Subtract 5 / 3 from both sides.]

n = 10 - 5 / 3
[Subtract the numerators.]

n = 5 / 3

So, the value of the missing number is 5 / 3.


Correct answer : (4)
 7.  
Find the value of the missing number n.
n + 2 5 = 4 5
a.
2 5
b.
2 7
c.
2 11
d.
2 3


Solution:

n + 2 / 5 = 4 / 5
[Original algebraic expression.]

n = 4 / 5 - 2 / 5
[Subtract 2 / 5 from both sides.]

n = 4 - 2 / 5
[Subtract the numerators.]

n = 2 / 5

So, the value of the missing number is 2 / 5.


Correct answer : (1)
 8.  
What is the value of n in the number sentence n - 8 = 3?
a.
8
b.
9
c.
10
d.
11


Solution:

n - 8 = 3
[Original algebraic equation.]

n = 3 + 8
[Add 8 on both sides.]

n = 11

So, the value of n is 11.


Correct answer : (4)
 9.  
Find the value of the missing number n.
n + 4 11 = 13 11
a.
10 11
b.
9 11
c.
9 10
d.
11 9


Solution:

n + 4 / 11 = 13 / 11
[Original algebraic expression.]

n = 13 / 11 - 4 / 11
[Subtract 4 / 11 from both sides.]

n = 13 - 4 / 11
[Subtract the numerators.]

n = 9 / 11
[Simplify the fraction.]

So, the value of the missing number is 9 / 11.


Correct answer : (2)
 10.  
Find the value of the missing number n.
n + 7 12 = 16 12
a.
3 4
b.
3 5
c.
4 5
d.
1


Solution:

n + 7 / 12 = 16 / 12
[Original algebraic expression.]

n = 16 / 12 - 7 / 12
[Subtract 7 / 12 from both sides.]

n = 16 - 7 / 12
[Subtract the numerators.]

n = 9 / 12

n = 3 / 4
[Simplify the fraction.]

So, the value of the missing number is 3 / 4.


Correct answer : (1)

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