Calculate (1/10)18-(1/10)20?

18/10 - 20/10
=(18 - 20)/10
= -2/10 = -1/5

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18/10 -20/10 = 2/10 =1/5

(1/10)18-(1/10)20

=18/10 - 20/10
= (-2/10)
= (-1/5)...

Think of multiplying whole numbers to fractions as multiplying the whole number to the numerator (since the denominator of any whole number is 1 and any number multiplied to 1 is equal to itself).

Thus, (1/10)(18) - (1/10)(20) is also the same as [(1 ∙ 18)/10] - [(1 ∙ 20)/10]. Simplifying this will yield 9/5 - 2 which is equal to -1/5.

(18/10) - (20/10)
(9/5) - 2
(9/5) - (10/5)
(9-10)/5
-1/5

18/10 = 9/5
20/10 = 10/5
so, 9/5 - 10/5 = -1/5 = -0.2

Use distribution in reverse.
Remember that a(b+c)=ab+ac. Here, we're given ab+ac, so we can use this backwards.
(1/10)18-(1/10)20=(1/10)(18-20)
=(1/10)(-2)=-2/10=-1/5.
Hope this helps.

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