Question

Q1.Evalute the following either by direct method or by using a number line.(a)3+(-2) (b)-3+4+(-7) (c)8-(-2)-3 (d)7+(-5)+1
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Answer 1

Answer:

Step-by-step explanation:

a) 3 + (-2) = 3 - 2 = 1

b) -3 + 4 + (-7) = -3 + 4 -7 = 4 - 10 = -6

c) 8 - (-2) - 3 = 8 + 2 - 3 = 5 + 2 = 7

d) 7 + (-5) + 1 = 7 - 5 + 1 = 2 + 1 = 3

Answer 2

Answer:

(a)1

(b)-6

(c) 7

(d)3

Step-by-step explanation:

Let's solve by direct mwthod.

We will follow the BoDMAS rule.

It means, priority is given from Bracket to Division, Multiplication, Addition and lastly subtraction.

So, let's solve the problems.

(a) 3+(-2)

= 3 - 2

= 1

(b) -3 + 4 + (-7)

= -3 + 4 - 7

= -3 - 7 + 4

= -(3+7) + 4

= - 10 + 4

= - (10-4)

= - 6

(c) 8-(-2)-3

= 8 + 2 - 3

= 10 - 3

= 7

(d) 7+(-5)+1

= 7 - 5 + 1

= 7 + 1 - 5

= 8 - 5

= 3

Hence,the values are

• (a) 1
• (b) -6
• (c) 7
• (d) e