Question 1144737
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1.  None of them.<br>
"10 times greater than x" means x, plus x 10 more times -- i.e., 11x.  The place values of the 5's in the given numbers are either 5, 50, or 500; none of those numbers is 11 times another of them.<br>
If you mean "10 times AS GREAT", then again the place values are either 5, 50, or 500.  Find one pair where the values of the two 5s are 5 and 50, or 50 and 500.<br>
2.  The value of the "7" in 270 is 7*10 = 70.  The value of the "7" in 207 is 7*1 = 7.  70 is 9 times greater than 7.  (70 = 7+63 = 7 + 9 times 7, so 9 times GREATER THAN 7).  70 is clearly 10 TIMES AS GREAT AS 7; it's not 10 times GREATER THAN 7.