7 and 9 are both divisible by one. 7 and 9 are both prime numbers, meaning the factors are 1 and themselves. The factors of 7 are 1 and 7. The factors of 9 are 1 and 9.
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The LCM is 504
6*9=54 so they both go into it evenly, but the lowest number is 18.
9
71 ÷ 9 = 7 with remainder 8
7 goes into 65 9 times with 2 leftover.