45 = 3 x 3 x 5, 72 = 2 x 2 x 2 x 3 x 3. Multiplying all factors would give 3240 but 3 x 3 appears in each so one instance of these can be ignored giving LCM of 360 (8 x 45, 5 x 72)
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The GCF of 36, 45, and 72 is 9.
The Greatest Common Divisor of 675, 72 is 9.
9- 18, 27, 36, 45, 54, 63, 72, 81, 90, 99, 10812- 24, 36, 48, 60, 72, 84, 96, 108
Since 36 is a factor of 72, all of its factors are included in the factors of 72.
The highest common factor of 36 and 72 is 36