Question

Subtract.

86,700,000−3.45×10^7



a.5.22
b.5.22×10^6
c.5.22×10&7
​ d.5.22×10^8

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Answer 1

5.22 ...............

I solved directly
..
86,700,000-34500000
the answer can't be b,c,d
because no zero will remain

Answer 2

( 86,700,000 ) - ( 3.45 × 10^{ 7 } )



Expand 86,700,000 in a product of numbers where one number should be 10 as we have to subtract a number from this which has 10 .

86,700,000 = 10 × 10 × 10 × 10 × 10 × 867


But the number contains 10^{ 7 }, so again expanding 867 in two numbers where 10 is compulsory.

867 = 10 × 10 × 8.67



So we can write 86,700,000 as ( 8.67 × 10 × 10 × 10 × 10 × 10 × 10 × 10 ) → 8.67 × 10^{ 7 }




Now ,

( 86,700,000 ) - ( 3.45 × 10^{ 7 } )

( 8.67 × 10^{ 7 } ) - ( 3.45 × 10^{ 7 } )


In both the numbers,10^{ 7 } is common.


10^{ 7 } [ ( 8.67 × 1 ) - ( 3.45 × 1 )

10^{ 7 } ( 8.67 - 3.45 )

10^{ 7 } ( 5.22 )

10^{ 7 } × 5.22

5.22 × 10^{ 7 }



Therefore,option C is correct.
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