Secondary School (English Medium) (5 to 8) Class 7 - CBSE Question Bank Solutions for Mathematics

Find the following product: (– 25) × 37 × 4

Find the following products: (– 18) × (– 10) × 9

Find the following products: (– 20) × (– 2) × (– 5) × 7

Find the following products: (– 1) × (– 5) × (– 4) × (– 6)

Find 16 × 12.

Find (– 23) × 48

Find (– 35) × (– 98).

Find 52 × (– 8) + (–52) × 2

(–157) × (–19) + 157 = ______.

If * is an operation such that for integers a and b we have a * b = a × b + (a × a + b × b) then find (–3) * (–5)

If * is an operation such that for integers a and b we have a * b = a × b + (a × a + b × b) then find (–6) * 2

If Δ is an operation such that for integers a and b we have a Δ b = a × b – 2 × a × b + b × b (–a) × b + b × b then find 4 Δ (–3) Also show that 4 ∆ (–3) ≠ (–3) ∆ 4.

The given table shows the freezing points in °F of different gases at sea level. Convert each of these into °C to the nearest integral value using the relation and complete the table,

`C = 5/9 (F - 32)`

A green grocer had a profit of ₹ 47 on Monday, a loss of ₹ 12 on Tuesday and loss of ₹ 8 on Wednesday. Find his net profit or loss in 3 days.

In a test, +3 marks are given for every correct answer and –1 mark are given for every incorrect answer. Sona attempted all the questions and scored +20 marks though she got 10 correct answers.

1. How many incorrect answers has she attempted?
2. How many questions were given in the test?

In a true-false test containing 50 questions, a student is to be awarded 2 marks for every correct answer and –2 for every incorrect answer and 0 for not supplying any answer. If Yash secured 94 marks in a test, what are the possibilities of his marking correct or wrong answer?

A multistorey building has 25 floors above the ground level each of height 5 m. It also has 3 floors in the basement each of height 5 m. A lift in building moves at a rate of 1 m/s. If a man starts from 50 m above the ground, how long will it take him to reach at 2nd floor of basement?

3.2 × 10 = ______.

25.4 × 1000 = ______.

93.5 × 100 = ______.