Expressions using Letter-Numbers — Important Questions
CBSE · Class 7 · Mathematics
45 important questions from Expressions using Letter-Numbers for CBSE Class 7 Mathematics, with answers. Part of the CBSE Class 7 Mathematics syllabus.
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Important Questions from Expressions using Letter-Numbers
Which of the following are like terms? (Select all correct answers)
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3x and 5x, 2y and 7y, 8 and 12
Like terms have the same variable with the same power. 3x and 5x both have variable x, 2y and 7y both have variable y, and 8 and 12 are both constants (no variables).
Simplify: 5a + 3b - 2a + b
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3a + 4b
Step 1: Group like terms: 5a - 2a + 3b + b. Step 2: Combine like terms: (5 - 2)a + (3 + 1)b = 3a + 4b.
Which expressions are equivalent to 6x? (Select all correct answers)
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3x + 3x, 2x + 4x, 5x + x, x + x + x + x + x + x
All expressions that simplify to 6x are equivalent: 3x + 3x = 6x, 2x + 4x = 6x, 5x + x = 6x, and six x's added together = 6x.
If x = 7, what is 4x - 10?
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18
Step 1: Substitute x = 7 in 4x - 10. Step 2: 4x - 10 = 4(7) - 10 = 28 - 10 = 18.
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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