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3)
I am not sure if this d = 1 / 2^3 * 5^7 means d = 1 /( 2^3 * 5^7) or this means d = 5^7/ 2^3?
If its the first one.
1/(2^3 * 5^3 * 5^4)
1/(10^3*5^4)
multiplying num and den by 10^4
10^4/(10^7*5^4)
(10/5)^4/(10^7)
or 2^4/10^7
so it has 7 decimal digits
4) Finding LCM of 90, 196 and 300
=> 9 * 25 * 49 * 4
=> 9 * 49 * 100
so 600 is not a factor
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