Secondary School (English Medium) (5 to 8) Class 8 - CBSE Question Bank Solutions

Using identities, evaluate 78 × 82

Using identities, evaluate 8.9²

Using identities, evaluate 1.05 × 9.5

Using a² − b² = (a + b) (a − b), find 51² − 49²

Using a² − b² = (a + b) (a − b), find  (1.02)² − (0.98)²

Using a² − b² = (a + b) (a − b), find 153² − 147²

Using a² − b² = (a + b) (a − b), find 12.1² − 7.9²

Using (x + a) (x + b) = x² + (a + b) x + ab, find 103 × 104

Using (x + a) (x + b) = x² + (a + b) x + ab, find 5.1 × 5.2

Using (x + a) (x + b) = x² + (a + b) x + ab, find 103 × 98

Using (x + a) (x + b) = x² + (a + b) x + ab, find 9.7 × 9.8

If PQRS is a parallelogram, then ∠P – ∠R is equal to ______.

The sum of adjacent angles of a parallelogram is ______.

In parallelogram FIST, find ∠SFT, ∠OST and ∠STO.

In the given parallelogram YOUR, ∠RUO = 120° and OY is extended to point S such that ∠SRY = 50°. Find ∠YSR.

(a + b)² – 2ab = ______ + ______.

The sum of areas of two squares with sides 4a and 4b is ______.

(a + b)² = a² + b² 

The difference of the squares of two consecutive numbers is their sum.