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NCERT Math Algebra Answer Key: CBSE & BSEB Solutions

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6A. Algebraic Expression

1.

  • a.
  • b.
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  • d.
  • e.
  • f.
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  • h.
  • i.
  • j.
  • k.

2.

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  • e.

3.

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4.

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  • f.

5.

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  • f.

6.

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7.

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8.

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9.

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10.

  • a. Monomial
  • b. Binomial
  • c. Monomial
  • d. Trinomial
  • e. Trinomial
  • f. Monomial
  • g. Binomial
  • i. Monomial
  • j. Polynomial (or Trinomial if like terms are combined)

11.

  • a. , , ,
  • b. , , ,

12.

  • a. ,
  • b. , ,
  • c. ,
  • d. , , ,

13.

  • a.
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  • f.
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  • i.

14.

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15.

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16.

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17.

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  • g.

18.

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19.

  • a.
  • b.

20.

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  • f.
  • g.
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  • k.
  • l.
  • m.

6B. Simple Equations

1.

  • a.
  • b.
  • c.

2.

  • a. A number decreased by 7 is equal to 14.
  • b. Twice a number is equal to 18.
  • c. 11 increased by three times a number equals 17.
  • d. 3 subtracted from twice a number equals 13.
  • e. 30 subtracted from 12 times a number equals 6.
  • f. Two-thirds of a number is equal to 8.

3.

  • a. (Hence, verified)
  • b. (Hence, verified)

4.

  • a.
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  • d.
  • e.
  • f.

5.

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  • h.

6.

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7.

  • a.
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8.

  • a.
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  • f.
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  • i.
  • j. (Note: labelled as first k)
  • k. (Note: labelled as second k)
  • l.

9.

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  • d.
  • e.
  • f.
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10.

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11.

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  • e.

6C. Exponents and Powers

1.

  • a.
  • b.
  • c.
  • d.
  • e.
  • f.

2.

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3.

  • a.
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  • c. (or )
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4.

  • a. (Since )
  • b. (Since )
  • c. (Since )
  • d. (Since )

5.

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6.

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7.

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8.

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  • f.

9.

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  • f.

10.

  • a.
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  • d.

11.

  • a.
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  • f.

12.

  • a.
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13.

  • a.
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14.

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15.

  • a.
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16.

  • a.
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  • d.

17.

  • a. (or )
  • b.
  • c.

18.

  • 279404:
  • 3006194:
  • 2806196:
  • 120719:
  • 20068:

19.

  • a.
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  • d.

20.

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21.

  • a.
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  • d.
  • e.

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