Add without using number line :
(a) $ 11+(-7) $
(b) $(– 13) + (+ 18)$
(c) $(– 10) + (+ 19)$
(d) $(– 250) + (+ 150)$
(e) $(– 380) + (– 270)$
(f) $(– 217) + (– 100)$

To do :

We have to add the given terms without using the number line.

Solution :

We know that,

$(+) \times (-) = (-)$

$(+) \times (+) = (+)$

$(-) \times (-) = (+)$

$(-) \times (+) = (-)$

(a) $11+(-7) = 11-7$

$= 4$

Therefore,

The sum of $11$ and $-7$ is $4$.

(b) $(-13)+(+18) = -13+18$

$=18-13$

$= 5$

Therefore,

The sum of $(-13)$ and $+18$ is $5$. 

(c) $(-10)+(+19) = -10+19$

$=19-10$

$= 9$

Therefore,

The sum of $(-10)$ and $+19$ is $9$. 

(d) $(-250)+(+150) = -250+150$

$=-(250-150)$

$= -100$

Therefore,

The sum of $(-250)$ and $+150$ is $-100$. 

(e) $(-380)+(-270) = -380-270$

$=-(380+270)$

$= -650$

Therefore,

The sum of $(-380)$ and $(-270)$ is $-650$. 

(f) $(-217)+(-100) = -217-100$

$=-(217+100)$

$= -317$

Therefore,

The sum of $(-217)$ and $(-100)$ is $-317$.  

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Updated on: 10-Oct-2022

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