523 - it is 500 added with 23, 498 - it is 500 take away 2, 601 - it is one more than 600, 650 - it is 50 less than 700, 546 - it is 1000-454 , 862 - it is the double of 431, 444 - it is 111 times 4, 333 - it is 999 divided by 3, 729 - it is 29 more than 700, 4321 - it is half of 8642, 666 - it is 2 times 333, 568 - it is 1000-432, 18 - it is 9 times 2 as well as 6 times 3, 246 - it is double of 123,

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