1. Add: 3x + 5x
- A8x
- B15x
- C8x²
- D2x
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Answer: A) 8x
Like terms add by adding coefficients: 3x + 5x = (3 + 5)x = 8x.
Class 7 Adding and Subtracting Expressions — practice questions with answers
Algebra · 5 sample questions from the school syllabus. Try each one, then open the answer and the worked solution.
2. Subtract: 12ab - 5ab
- A7ab
- B17ab
- C7
- D7a²b²
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Answer: A) 7ab
12ab - 5ab = (12 - 5)ab = 7ab.
3. A rope is (7y + 10) metres long. Arjun cuts off a piece (3y + 4) metres long for a kite at a Jaipur fair.
What length of rope remains, in terms of y?
What length of rope remains, in terms of y?
- A4y + 6
- B4y + 14
- C10y + 6
- D4y - 6
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Answer: A) 4y + 6
Remaining = (7y + 10) - (3y + 4) = (7y - 3y) + (10 - 4) = 4y + 6.
4. Three friends in Bhopal pool money for a gift. Ravi gives ₹(3x + 4), Sita gives ₹(2x + 6) and Mohan gives ₹(x - 2).
What is the total amount collected, in terms of x?
What is the total amount collected, in terms of x?
- A6x + 8
- B6x + 12
- C5x + 8
- D6x - 8
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Answer: A) 6x + 8
Total = (3x + 4) + (2x + 6) + (x - 2) = (3x + 2x + x) + (4 + 6 - 2) = 6x + 8.
5. Subtract (x² - 2x + 3) from the sum of (3x² + x - 2) and (x² + 4x + 1).
What is the final expression?
What is the final expression?
- A3x² + 7x - 4
- B3x² + 3x - 4
- C5x² + 7x - 4
- D3x² + 7x + 2
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Answer: A) 3x² + 7x - 4
Sum = (3x² + x - 2) + (x² + 4x + 1) = 4x² + 5x - 1. Subtract: (4x² + 5x - 1) - (x² - 2x + 3) = 3x² + 7x - 4.
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