NCERT Exemplar Solutions
Class 7 - Mathematics - Unit 1: Number System - Multiple Choice QuestionsQuestion 22
Class 7 - Mathematics - Unit 1: Number System - Multiple Choice Questions
Question. 22
Which of the following is different from the others?
(a)
\(20+(–25)\)
(b)
\((–37)–(–32)\)
(c)
\((–5)\times(–1)\)
(d)
\((45)\div(–9)\)
Detailed Answer with Explanation:
Let’s simplify each option one by one. We will see what number we get.
(a)
(20 + (-25))
(= 20 - 25)
(= -5)
(b)
Subtracting a negative is the same as adding a positive.
((-37) - (-32))
(= (-37) + 32)
(= -5)
(c)
Negative × Negative = Positive.
((-5) imes (-1))
(= +5)
(d)
Positive ÷ Negative = Negative.
(45 div (-9))
(= -5)
Conclusion: Options (a), (b), and (d) all give (-5). Option (c) gives (+5). So the one that is different is (c).