Find the sum of:
(i) 120 and $- 274$
(ii) $- 68$ and 28

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Solution

(i) Method - I: Sum $= + 120 + (- 274)$
$\begin{matrix} = + 120 + (- 120 - 154) = + 120 - 120 - 154 ∴ 120 + (- 274) = - 154 \end{matrix}$
Method - II:
As the given numbers have opposite sign, we subtract one from other
$\begin{matrix} - 274 120 - 154 \end{matrix}$
As 274 is having negative $(-)$ sign, the answer is $- 154$ .
ii) $- 68$ and 28
Sum $= - 68 + (28)$
$= - 40 - 28 + 28$
$∴ - 68 + 28 = - 40$

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Find the sum of: (i) 120 and −274 (ii) −68 and 28

Find the sum of:
(i) 120 and $- 274$
(ii) $- 68$ and 28