Question

(d) {9+(-12)} + (...........) = 9+ {(-12)+(-7)}
Example 11:
rounds. Which team scored more? Can in
Solution:
Total score of team 'A' = -40 + 50 + 0 = ( 40 + 50) + 0 = 10 + 0 = 10
50 - 40 = 10
Total score of team 'B' = 50+ 0 - 40 = 50 + 10 + (-40)}
Thus, the score of both the teams is same.
Yes, we can add integers in any order.
Example 12: Fill in the blanks to make the following statements true:
(a) (-3) + (-7)= (-7) + (...........) (b) -28 + .........
0
(c) 19 + (...........) = 0
Solution:
(a) -3
(b) 28
(c) -19
(d) -7
EXERCISE 1.2
1. Write down a pair of integers whose:
(a) sum is - 9
(b) difference is -18 (c) sum is -1
2. Write a negative integer and a positive integer whose sum is -15.
3. Write a negative integer and a positive integer whose difference is 11.
4. In a quiz, team A scored 20, -10, 34 and team B scored -10, 20, 34 in three successive
rounds. Which team scored more?
Multiplication of Integers
We all know how to multiply natural numbers. Now we will learn how to multiply two integers. In
fact multiplication of integers is equal to repeated addition. We will use number line to understand
multiplication of integers.​

Answer 1

Answer:

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Answer 2

Step-by-step explanation:

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