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Question

Find the value of :
a)   -392+ (-5)+ (-8)+ (-15)
b)  -137 + 854 —84+ 506
c)  subtract  (-89) from (-54)
d)  389+ (54) —774+ (-39)


Solution

a)the number given are full negative and we can take - as common oustside
so we can write -(392+5+8+15)=-420        ##if we multiply that - inside the bracket it again changes to -392+-5+-8+-15 so both are correct..##


b)group the negative and positive numbers togetherness for easiness
-137-84+854+506

take the common negative from first tow numbers and simply add the last two numbers

-(137+84)+1360

now add the numbers inside the bracket
-(221)+1360

now 1360 is larger than 221...so now subtract 221 from 1360 ie.1360-221=1139


c)so we need to subtract -89 for -54
ie-54- (-89)        we know - multipiled by - is + 

so question becomes -54+89 
so 89 is greater than 54
so subtarct 54 from 89
 so 89-54=35

therefore subtracting -89 from -54 is same as subtarcting 89 from -54



d)this question si same as 389+54-774-39    as we know - multiplied by + is -

so here we add 1st two numbers and from the last two numbers we take the - as common outside

ie.389+54-(774+39)
=443-(774+39)

now we add the terms inside the bracket
=443-813

so 813 is greater than 443

so here we subtarct 443 from 813 and will put a negative sign along with the answer

so it will be -(813-443)=-370



 

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