Ex.1.2 Q2 Integers - NCERT Maths Class 7
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a) Write the pair of negative integers whose difference gives \(8.\)
b) Write a negative integer and a positive integer whose sum is \(–5.\)
c) Write a negative integer and a positive integer whose difference is \(–3.\)
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What is known?
The two integers whose sum and difference is given.
What is unknown?
Sum and difference of a pair of integers.
Reasoning:
Add or subtract the two values.
Steps:
a) Let us have \(-2\) and \(-10\)
\[\begin{align}\therefore{\rm{Difference}}& = (-2)\,-(-10) \\&=- 2 + 10\\&= 8\end{align}\]
b) Let us have \(-10\) and \(5\)
\[\begin{align}\therefore\rm{Sum} &= -10\,+\,5 \\&=\,-5\end{align}\]
c) Let us have \(-2\) and \(1\)
\[\begin{align}\therefore\rm{Difference} &= -2\,-\,1\\&=\,-3\end{align}\]
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