Q

# Find : (a) 35 - (20)

1.  Find

(a) $\inline 35-(20)$

(b) $\inline 72-(90)$

(c)  $\inline (-15)-(-18)$

(d)  $\inline (-20)-(13)$

(e) $\inline 23-(-12)$

(f) $\inline (-32)-(-40)$

Views

It is known that the sum of $-a + (a) = 0$
So, we have to split the number in order to cancel out with other numbers.

(a) $\inline 35-(20)$
= 15 + (- 20) + 20
= 15 + 0 = 15

(b) $\inline 72-(90)$
= 72 - (72) - 18
= 0 - 18 = -18

(c)  $\inline (-15)-(-18)$
= (- 15) + 18
= (- 15) + (15) + 3
= 0 + 3 = 3

(d)  $\inline (-20)-(13)$
= - (20 + 13 )
= -33

(e) $\inline 23-(-12)$
= 23 + 12
= 35

(f) $\inline (-32)-(-40)$
= (- 32) + 40
= (- 32) + (32) + 8
= 0 + 8
= 8

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