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SAI International School
CLASS-VII

Mathematics
CHAPTER- 12: Algebraic Expression

Home Assignment-12.2

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1. Simplify combining like terms: 5x y – 5x + 3yx – 3y + x – y + 8xy – 3y 2
2. Add: 14x + 10y – 12xy – 13, 18 – 7x – 10y + 8xy, 4xy
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3. Subtract: –m + 5mn from 4m – 3mn + 8
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4. What should be added to x + xy + y to obtain 2x + 3xy?
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5. What should be taken away from 3x – 4y + 5xy + 20 to obtain
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– x – y + 6xy + 20?
6. From the sum of 3x – y + 11 and – y – 11, subtract 3x – y – 11.

Answers:
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1. 8x y – 4x – 7y + 8xy 2
2. 7x + 5
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3. 5m – 8mn + 8
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4. x + 2xy – y 2
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5. 4x – 3y – xy
6. 3x – 2y