Secondary School (English Medium) (5 to 8) इयत्ता ८ - CBSE Question Bank Solutions for Mathematics

Aman’s age is three times his son’s age. Ten years ago he was five times his son’s age. Find their present ages.

All rhombuses are kites.

In a right triangle ABC, ∠B = 90° If AB = 6 cm, BC = 8 cm, find AC.

In a right triangle ABC, ∠B = 90°. If AC = 13 cm, BC = 5 cm, find AB.

Add: p (p − q), q (q _­­­− r) and r (r ­− p)

Add: 2x (z − x − y) and 2y (z − y − x)

Subtract: 3l (l − 4m + 5n) from 4l (10n − 3m + 2l)

Subtract: 3a (a + b + c) − 2b (a − b + c) from 4c (− a + b + c)

Find and correct the errors in the statement: 4(x − 5) = 4x − 5

Find and correct the errors in the statement: x(3x + 2) = 3x² + 2

Find and correct the errors in the statement: 2x + 3y = 5xy

Find and correct the errors in the statement: x + 2x + 3x = 5x

Find and correct the errors in the statement: 5y + 2y + y − 7y = 0

Find and correct the errors in the statement: 3x + 2x = 5x²

Find and correct the errors in the statement: (2x)² + 4(2x) + 7 = 2x² + 8x + 7

Find and correct the errors in the statement: (2x)² + 5x = 4x + 5x = 9x

Find and correct the errors in the following mathematical statement. Substituting x = −3 in 

x² + 5x + 4 gives (−3)² + 5 (−3) + 4 = 9 + 2 + 4 = 15

Find and correct the errors in the following mathematical statement. Substituting x = −3 in 

 x² − 5x + 4 gives (−3)² − 5 (−3) + 4 = 9 − 15 + 4 = −2

Find and correct the errors in the following mathematical statement. Substituting x = −3 in  x² + 5x gives (−3)² + 5 (−3) = −9 − 15 = −24