Linear equations in one variable Quiz - ICSE Class 7 Mathematics

Free practice quiz: Linear equations in one variable (ICSE Class 7 Mathematics). 59 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. If 3x + 5 = 20, what is the value of x?

   1. 5
   2. 6
   3. 7
   4. 8
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   Answer: A. 5

   To find x, subtract 5 from both sides of the equation: 3x = 20 - 5. This gives 3x = 15. Then, divide both sides by 3: x = 15 / 3, which equals 5.

2. If 7x - 3 = 4x + 9, what is the value of x?

   1. 3
   2. 4
   3. 5
   4. 6
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   Answer: B. 4

   Subtract 4x from both sides: 7x - 4x - 3 = 9, so 3x - 3 = 9. Add 3 to both sides: 3x = 9 + 3, which means 3x = 12. Divide by 3: x = 12 / 3, so x = 4.

3. The difference between twice a number and 5 is equal to the number increased by 3. Find the number.

   1. 7
   2. 8
   3. 9
   4. 10
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   Answer: B. 8

   Let the number be 'x'. The equation is 2x - 5 = x + 3. Subtract x from both sides: 2x - x - 5 = 3, so x - 5 = 3. Add 5 to both sides: x = 3 + 5, which is 8.

4. If 3/5 of a number is 21, what is the number?

   1. 30
   2. 32
   3. 35
   4. 38
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   Answer: C. 35

   Let the number be 'z'. The equation is (3/5)z = 21. Multiply both sides by the reciprocal of 3/5, which is 5/3: z = 21 * (5/3). This calculates to z = 105/3, so z = 35.

5. If 20 is subtracted from twice a number, the result is 10. Find the number.

   1. 10
   2. 15
   3. 20
   4. 25
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   Answer: B. 15

   Let the number be 'x'. The equation is 2x - 20 = 10. Add 20 to both sides: 2x = 10 + 20, so 2x = 30. Divide by 2: x = 30 / 2, which is 15.

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