Verify the following: 18 × 7 + - 3 = 18 × 7 + 18 × - 3

Given, 18 × 7 + - 3 = 18 × 7 + 18 × - 3 Solving LHS, we get: ⇒ 18 4 ⇒ 72 Solving RHS, we get: ⇒ 126 + - 54 ⇒ 126 - 54 ⇒ 72 Therefore, we get: L H S = R H S Hence, verified.

Verify the following: - 21 × - 4 + - 6 = - 21 × - 4 + - 21 × - 6

Given, - 21 × - 4 + - 6 = - 21 × - 4 + - 21 × - 6 Solving LHS, we get: ⇒ - 21 × - 10 ⇒ 210 Solving RHS, we get: ⇒ 84 + 126 ⇒ 210 Therefore, we get: L H S = R H S Hence, verified.

Write five pairs of integers a , b such that a ÷ b = - 3 . One such pair is 6 , - 2 because 6 ÷ - 2 = - 3 .

Given, To write five pairs of integers a , b such that a ÷ b = - 3 . Therefore, we get: 9 , - 3 ⇒ 9 ÷ - 3 = - 3 3 , - 1 ⇒ 3 ÷ - 1 = - 3 - 12 , 4 ⇒ - 12 ÷ 4 = - 3 18 , - 6 ⇒ 18 ÷ - 6 = - 3 - 15 , 5 ⇒ - 15 ÷ 5 = - 3 Hence, we get five required pairs of integers.

E M B I B E

START UP MATHEMATICS>Chapter 1 - Integers>VALUE AND LIFE SKILLS>Q 1

MEDIUM

7th CBSE

IMPORTANT

Earn 100

An elevator descends into a mine shaft at the rate of $9 m$ per minute. If the descent starts from $20 m$ above the ground level, how long will it take to reach $- 250 m$ ? Have you ever been in an elevator? what will you do if you are stuck in an elevator?

Important Questions on Integers

MEDIUM

7th CBSE

IMPORTANT

START UP MATHEMATICS>Chapter 1 - Integers>VALUE AND LIFE SKILLS>Q 2

A chair costs

₹ 120

. Peter bought

30

chairs. By mistake the shopkeeper charged

₹ 10

less per chair. To be fair to all, find whether Peter had to pay or receive the money. What is the extra amount? What will you do if by mistake, shopkeeper returns you extra money?